I'd give a prime Ortiz a really good chance to KO Khan and I think Guerrero would beat him right now. Khan gets KO with a Floyd counter.
Loses 9-3 to mayweather unless mayweathers reflexes are shot to **** when they meet which I doubt they will be , but never know with age prob loses a tko10 to pacquiao. He's not on either of their levels. Maybe outbox Marquez and Bradley then I think he's as ready as he'll ever be
I'd be surprised if Khan won more than 3 rounds. Mayweather has fought fast guys before and adapted to win.