Gomez and Arguello are Pacquiao's best chances. Sanchez against Pacquiao would be a very good fight with Sanchez winning. Duran would be too much for Pacquiao, and Pacquiao against Pryor at 140lbs spells stoppage loss for Pacquiao.
Thats tough, I think he would beat some, and lose to others. I dont think he would get blown out though.
Gomez KO6 Pacman at 122 Sanchez KO4 PAcman at 126 Arguello KO5 Pacman at 130 or 135 Duran KO2 Pacman at any weight Pryor TKO3 Pacman at 140