I mentioned as much in my initial post. That being said, there hasn't been enough time for too many people to rent the game and then return it, it's a long game. I know that Gamefly has had it listed as very low-low stock since release, which means that very few of the initial batch of copies they sent out to people have been returned already. That means that most of those rental copies have only accounted for 1-2 positions on the leaderboards so far. Also rental copies still make a profit for MS, companies still have to buy the game from MS (I think rental copies cost more than consumer copies as well, not sure though).

Same goes for the other points, the fact that it's a long game suggests that most people haven't finished the game themseves yet, which most people do before they resell or lend a game, assuming the game is good of course (and FH2 has recieved alot of praise). 

I feel like at least 350-400k of those 500k positions on the leaderboards are sold copies. That's not bad at all for 3 weeks after release, it suggests the game will at least sell 1 million copies lifetime. And that'll likely be enough to justify a sequel.

Mordor is just...so good. So good.

Finished it on PS4 (got a lot of the collectibles, not all yet).