I don't think Khan stops Pacman. Khan would go for broke and leave himself open and get knocked out. Manny got knocked out with a perfectly timed counter, but Khan has been stopped twice by lucky punches and almost hit by Peterson. Khan is not at Pacman's boxing level.
I don't think Pacquiao is the same fighter, I'm saying this fight wouldn't be a joke, Manny fans need believe it was a lucky punch.
One shot to the neck and Khan would crumble. He needs feather punchers to build his confidence at this stage.It's not like he can be accused of taking easy fights before Molina.
I see their careers taking different paths. Personally I think Khan force the Garcia rematch and come unstuck again.