I'm null on iaafr, but if I were to scumread him, I think the reasoning is completely opposite. He isn't timid or meek: he's actually posting new reads with new reasonings that others haven't posted. He's shifting the train from ian/wolfy/me to magic/hbotz/you.
Now, if one of ian/wolfy is scum, this is a good way to protect them: he doesn't actually defend ian, just shifts focus away from him. He has repeatedly defended wolfy, so that could be a TMI townread, and he only started shifting the train once it moved from wolfy to ian.
Definitely possible there's an iaafr/ian team, but that only makes sense because iaafr is pushing train shifts, which is the opposite of meek/timid.