I'm not sure what is going on with Stan and the org - but they need to move him (or wave him) if they don't intend to play him.
Him sitting in the PB goes against what the org would need to do to fulfill their own prophecy (which I assume is Stan becoming a big, physical, defensive dman).
He missed most of LY and isn't playing now - he was actually a better player 2 yrs ago. You can't hang onto him hoping he becomes more than he is, if you don't intend to play him - he's shown that he can't even hang onto what is already a low playing level, if he is not playing consistently.
So, if you go by what is unfolding now, there is no room for him, he's not playing well, and he's likely only going to get worse if he sits - IOW's, he's not going to be an effective PB player.
I would have to think the org is looking at their options with Stan now - and the longer they wait, the less options they will have.