No matter what BG's reasons for leaving were, it seems to make sense why there's a big difference between posting at WL and at the RX for him.
There's no need for write-ups at WL since it is strictly a pick-em oriented contest. I am sure his detailed write-ups were time consuming.
Also, with the nature of his following here, he probably felt obligated to keep checking in on his RX threads to answer questions and etc.
Whether his plays were really being ripped off, or if he just got sick of the daily grind, or whatever his reasons were, it makes sense that he'd continue posting his plays at WL. He's doing well in the contest and he can easily make his selections (strategically before gametime if you want to assume they were being ripped off) without the need for write-ups, Q & A and recaps. All he has to do is post before gametime and then he's done for the day without any other responsibilities or maintenance.
It will be interesting to see what he does next season. If he is nowhere to be found (including being absent from WL), then it probably will feed the fire for the "went tout" conspiracy theories. But who knows. He may resurface here again or somewhere else. I personally will reserve judgement about BG's motives until presented with factual or first-hand evidence.