Pro coaches do not have to sell their program to recruits, they just draft who they want. That is a big reason some great college coaches don't translate to NFL, main skill set is worthless.
Maybe low key guys can recruit in college (Snyder? Kstate, Patterson, TCU) but I haven't seen any signs yet that Claeys has that ability. I don't think you need to extend him. You keep him under contract on the existing contract if you want to keep him and make him prove he can do it next year. Giving him an extension (that can be bought out) doesn't solidify his being the coach for the next 4 years. Winning more next year solidifies his job for the next 4 years regardless of whether you extend him and recruits can see that the same way. Losing more next year with or without an extension has him gone too, just changes the price tag.