We don't really know he hasn't used the same technique on everyone, though.
I have to say, I really wouldn't have minded your suggestion about Prowl. It would make sense. But at the same time, this new Prowl wasn't exactly himself, either. So maybe not.
I keep saying this on various boards: I'm going to wait and see how it develops.
There are flaws, yes, but I enjoyed how Barber is trying to patch up pretty much the whole IDW continuity. All of it.
(Now that I've written it thought down, I believe that a lot of grief for some fans actually comes from that. I've seen comments along the lines of 'How dare you mention Chaos and the previous Ongoing? RUINED FOREVER'.