It's obvious that BJ's heart is really in the WW division, not the LW. However, it's also obviously that he'll probably never beat GSP unless he could put on about 20 or 30 quality pounds (and even then it's doubtful).
However, would he be the LW champ if there was no GSP?
I think he would probably have trouble with Fitch, Alves, and Kos, but in an even money match I'd probably have money on a motivated, in shape Penn.
Thoughts?