Admittedly, when Jon Seda left P.D. before, it was to attempt to help launch Chicago Justice as the fourth One Chicago series, and he returned to P.D. after Chicago Justice got the axe.
Jon Seda left P.D. and returned once before; could he do it again?
Maybe helping in Puerto Rico is exactly what Antonio needs to get back on his feet and return!
Peter Stone also survived the end of Justice, although he had to go to New York for a brief stint as the Law & Order: SVU ADA to keep fighting the good fight on NBC.