Would this make it the best selling game overall as well?

It will easily. Another incredible milestone for the ps4. And don't forget MW3 and BO2 were bundled with the 360. It's fair game but in the end BO3 PS4 will sell a few million more.

Untill Activision says something VGChartz numbers are unreliable.

But it might be possible considering almost one year being the most popular Ps4 bundle in NA and EU.

This. The PS4 bundle has been selling for about nine months now, but is finally on the way out. If Sony bundles the game with Infinite Warfare the way MS coupled the Tomb Raider games and Assassin's Creed, I could see it, but Sony tends to make single-game bundles, so I doubt it will be enough to carry it for another million. 

How is it pay to win? The loot boxes are set up exactly how Overwatch is and that's not pay to win.

Yeah, but it doesn't matter - bundle or not - as there are soooooo many bundles to choose from. Destiny, Uncharted 4, COD, Battlefront, etc. So if the COD bundle sells it means the buyers want THAT game. Simple as that!!!

Now if there was only ONE bundle to choose from, that's a whole different story as people will just buy the console with the game they want or don't want.

No not at all in Overwatch you only get cosmetics in Black Ops 3 you can get guns no one else can get due to it being RNG and by paying real money you have a higher chance of getting said weapons. You can get Melee weps in the crates also that are a 1 hit kill while the default melee is a 2 hit kill.

Don't you mean until Activison says something VGChartz numbers are the only ones reliable?  Unless you're saying nothing is reliable unless Activision says so?

Just cause you pay more to have a higher chance with it doesn't neccessarily mean you'll get it.  I have all the weapons in BO3 and I didn't pay a thing where I have friends that paid yet they didn't get the weapon they wanted.  As well, Treyarch made those random guns balanced, that why I barely see anybody use them more than the default guns.  And ALL default melee weapons and boxed melee weapons are one hit kills.  The coding for the melee weapons aren't different just different skin per say.  BO3 is definitely not a pay-to-win game.

De facto standard doesn't mean the only bundle. It means by far the most dominant bundle.

And lets be honest, would it matter what game they had in the bundle? PS4 was dominating the sales war before they starting bundling games with it.

Either way the bottom line is it sold tons as a bundle. You take that bundle away, plus introduce a new CoD game, the sales for it will tank compared to what they were.

Okay well it's still definitely not pay to win. I've never felt at a disadvantage with my primary setup to other players and the only thing I've paid for in that game is the DLC for zombies