JMM weighed 140 on fight night of the Juan Diaz fight... I'm guessing JMM will weigh-in at 138 then weigh 140 on fight night with Floyd... Floyd possibly weigh-in at the limit at 144/145 (?) then weigh 148 to 150 on fight night... JMM giving away 8 to 10 lbs to Floyd on fight night will be very dangerous when it's coupled with the many other physical advantages Floyd enjoyed over JMM...

Size - 8 to 10 lbs. advantage to PBF
Speed - PBF is much faster
Reach - 5" advantage to PBF
Age - JMM is older by 4 years
Height - 1" advantage to PBF