Erm, as a GK player who has used coteaz A LOT, I think you guts are making tok big a deal about this. He's a fine 100 pts, but he's not really better than a DA Libby, with divination and all the whiz bang toys they can get.
I know a lot of people are still traumatized by GK everywhere, but frankly, that was all 2 years ago.
Henchman are ok, can be very killy, but notably are never very durable.
I DO think its kinds lame this lets you add inquisition to any imperial codex with no penalty. I think it's lame that imperials get an ally chart that is so much more forgiving than xenos. I think it lame that they are developing so little rules into these supplements, and putting so little thought into it generally.
But competition wise, I don't think it'll matter much. Might give me an excuse put together an actually pretty hench squad.