Those numbers are a little skewed, and certainly don't tell the whole story.

For one, you made the gap seem to be about 30K closer than they really are. It's 736 vs 916.

Second, SO sold 230K in it's first week. Then sold 506K in the remaining 8. Uncharted sold 30K in it's first week, then 886K in the 8 weeks after that.

SO is no Uncharted.

Exactly my point. This brings me back to the fact that MS had an exclusives drought after the third parties they were paying for games went multiplat last gen. Microsoft moreso than Sony relies on sequels to keep interest in their console. 

Aye, but again, it does come down to what Insomniac's 'price' would be; the less inclined they are to settle for a more locked-in exclusivity, the higher that price is going to get. I've no doubt that Microsoft would be very interested in keeping the title, (and any others they can,) locked down to bolster their exclusive offerings, but how much they're willing to spend on this IP vs how much Insomniac will accept is another matter. Despite Microsoft's significant financial clout, there does seem to be a limit to their willingness to spend; their last major thing was Minecraft, and by the way they're treating the property- as a moneymaker rather than an exclusive franchise- they seem to be investing that 2 billion with the expectation of making even more back. They got Titanfall exclusivity, but only sort of, as the 360 version and PC version likely did limit its power as a 'system seller...' but making it an 'Xbox One ONLY' title would likely have cost them a lot more than they were willing to pay.

By that same token, I'm sure that EA has a price for which they'd make Titanfall 2 an Xbox One exclusive. However, given that would mean putting the title on the smaller install base, and would probably not endear EA to Sony in any way, that price is likely astrononomically high, especially if previous gen gets cut out for the sequel. It's one of the disadvantages when you don't have a sales lead in the largest market, and are lagging behind in most of the others to boot. xP Getting exclusivity on a property might cost you a premium, because it takes more money/incentives up front to counteract 'the other guy's' larger market and sales potential.

Anyway, not discounting this as a possibility. Just saying that it comes down to whether Insomniac and Microsoft can agree on a price, and any such deal would likely favor Insomniac considerably.

In SO, people get powers from those energy drinks. It implied that the MC got his powers from that. Yes, there's other games that have a similar concept. Still, SO is likely MS's answer to the infamous series and the game is strongly modeled after it. MS probably published that game for that reason. It's just a very light hearted version of it and there's enough differences that it could stand on it's own. I read that one of those MS people said that them getting tomb raider as a timed exclusive to answer sony's uncharted series. So it would not surprise me that MS had a game made as a answer to sony's infamous. It goes along with their line of thinking.

I don't think SO has the power to be a big IP, I can see it being as popular as inFAMOUS though.

In Sunset Overdrive, the main character already has the power innately, he just meets people who help him to expand his power and find weapons and clothing. A energy drink called overdcharge is responsible for transforming the citizens of the city into zombie like creatures and some are bigger than others. The whole point of the game is to save the world the way you want to and not to be weighed down by how many lives you have. You can die as many times as you want and come right back into the battle without an issue. The whole point is fun and InFamous despite being a fun game is not about that. The guns are definitely mostly a mix between Dead Rising and Ratchet and clank with the traversal of Tony Hawk and InFamous. 

Sunset Overdrive also has weapon buffs and character buffs like an RPG. When you actually play it you see how different it is from InFamous. Its something new made from many different things.

Microsoft had that same concept and setting in Crackdown two years before Infamous came out. I guess this makes Infamous Sony's answer to Crackdown?

That was my whole point. It is a great second tier game, but could use a lot of growth and trust me when Microsoft loses third party exclusivity as a generation gets more focused on multiplats then a game like this could really come in handy as its popularity grows over the years. Uncharted started off slowly as well. InFamous has always remained second tier and I wouldnt expect much moe than that for Sunset Overdrive.

Crackdown? I don't know it. I looked it up on here and on youtube. It's more of straight up 3rd person shooter than a third person action game about a guy with powers. It's gunplay, targetting and overall look is more similar to prototype. Infamous has nothing really in common with it except there were powers and being set in a open world sandbox. Everything else is different. Sony didn't really need a answer to that series. It's sales weren't that good.

There's not much similar between Sunset and Infamous either, especially gameplay wise. Even with a similar setting and genre, the gameplay is radically different.

And I don't think Microsoft really needs an answer for Infamous, either. There are loads of good open world games on the market.