Would never happen. Pac has 1 or 2 more fights before retiring. So he is not going to fight Khan - for what? They spar though. Guarantee is that Pac will be fighting Mayweather next if both Pac and Mayweather succeed. Then Mosley most probably as swan song. But knowing Arum, he would probably match Pac with Valero as retirement fight to maintain the in-house fighters theme.