Why? It's the least likely of all five fights that Khan is going to get ko'd. Don't like watching his fights when I know the cocky little **** is going to stay on his feet for 12 rounds.
I'd label myself as a mild-hater of Amir Khan. I enjoy seeing him bambi-legged, and eyes rolling around, looking for help from the ref/corner as much as the next person. But I'm also a fan of 50/50 fights, where the winner isn't an open & shut case, like a few of those others I've mentioned. Give me a real competitive fight, over a steamroller any day.
From all of those fights, I see this as the easiest to be made, and also makes the most sense for both fighters. There's "history" between the two, they're both big names in America, both former World Champions. The TV companies would have a field day marketing it in either Macau or Vegas, which would reward both fighters with decent purses. Probably much more than Khan would get, fighting any of the names above (barring Floyd, of course) There's also the angle that Khan desperately wants Mayweather, Manny's just lost to him, so if Khan put on an astonishing display, could he force a fight with Floyd, through public demand?
It'll also answer the question, can Pacman still cut it at Elite level? My guess would be no, but a decent performance here & then he's back in contention, if he so wishes. If he has a spectacular win, and a bit of media hype/persuasion, he could put himself in the mix for a rematch with Floyd (not that I'd really want to see it)
From the boxing side of it, I'd like to see that fight the most, because they're both very similar, stylistically. The technical side of it would be great. Manny has seemingly lost his killer finish, but still has quick hands. Khan has no power at 147lbs, but has very fast hand speed. Watching two fast punchers, go toe-to-toe, can be just as exciting as watching big punchers. Havent you heard the saying, "speed kills?" :) They know each other's strengths & weaknesses, they know how the other one moves around the ring, how good their footwork is, their balance. I'd be intrigued to see each of them moving in & out of range, changing the angles & pushing forward or dropping onto the back foot.
Very tough fight to call a winner, which could see some great action. That's why it's my preferred choice.