I don't think 154 will ever be a "natural" weight for him. He seems like a sterotypical "hardgainer" -- very low bodyfat, and a struggle to bulk up. Even if he quit training, I don't think he'd suddenly blow up. Look at Roger and Floyd Sr.
Honestly, I think he could still be making 140 fairly easily if he really wanted to.
I'd definitely like to see him vs. Martinez at 154 next though. That's a much more competitive fight than Pacquiao -- probably the biggest challenge out there (besides the same fight at 160).
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