Who wins? Mosley in my opinion was a monster at 135! Killer body puncher and his speed and combos where insane!
Suga Shane was a monster at 35, still can't believe how he made that weight considering he looked like a solid WW upon legitimately beating DLH at 47. He's waaay oversized for Loma while having more speed, more power, more mobility and more stamina. This is the rare occasion I'd pick Shane over Floyd as well, at least at that weight, just so much energy and lovely footwork though it's been decades I last watched him operate there. Shane UD or by stool TKO.
Most likely Mosley by KO. Doug Fischer, who followed Mosley's LW reign, talks about how Mosley was really a WW who boiled himself down to LW. Loma isn't a big LW, his best weight class is probably 130 pounds. Loma would be at a very big size disadvantage. And Mosley was fast as hell at LW with great combination punching and power (he stopped about everyone at LW except Phillip Holiday). I think he'd clip Loma at some point.
It's possible but Loma would need to fight a near perfect fight to win. A lapse like he had against Linares and he gets KTFO against Mosley, who really had one punch KO power at LW.