OK, makes a bit more sense now. 1 of Buff/Myers/Trouba has to play on the left. Myers is bad on the left. TBH I'm not sure why Buff doesn't take the left side. He is a rover anyway so it seems natural to me. I have probably had it explained to me half a dozen times but it doesn't stick. It may be as simple as Buff doesn't want to do it. He has seniority over Trouba.
Whatever the reason it has been decided that Trouba should be the one to play his off side and he has done it quite well. A bit of a negative for him but the upside is he gets to play with Buff. I'd bet that there are a lot of good young D in the league who would like to play with Buff. He should be happy - but he is not. The **** show follows from there.
I'm thinking that playing the off side is not the real reason that he wants out of WPG.