Top Rank and Golden Boy made a ton of fights together prior to the "war" they were in.
Oscar (GB) vs Pac (TR)
Hatton (GB) vs Pac (TR)
Mosley (GB) vs Cotto (TR)
etc
etc
etc
If Mayweather hates Top Rank that's his deal, Margarito & Cotto were both options for Floyd. If he didn't want to fight them because of Top Rank, that's on him, not because they weren't options for him, which they both were.
But once again, you missed the point completely. Pacquiao entered the WW division and his goal was to fight the best & biggest names there, and he did that.