i think he's thinking long-term he came back to boxing for the money, but i think he wants to finish undefeated and will schedule fights accordingly. then he can run around when retired referring to himself as the greatest of all time, and point to his undefeated record. i'm sure that's worth a good deal of money on the appearance circuit.
and if someone says "yeah, well, you wouldn't fight pacquiao," then he'll respond with the drug test crap.
as i see it, it's all very calculated.