Chances are, the Lions are done adding linemen of any consequence, and I don't think anyone they've added will change the starting lineup of Reiff->Sims->Raiola->Warford->Fox. But a couple of these guys could push Bill Nagy, Dylan Gandy, or Rodney Austin for a roster spot. Leroy Harris got a decently-sized two-year deal, and there is some speculation the Lions could be looking at him as Dominic Raiola's successor. We'll know more in training camp.
Thanks for your question, and also for your service.