After all, despite Jon Seda’s very temporary move to Chicago Justice, he was key to the foundation of P.D. It’s not out of the realm of possibility that Seda could reprise his role at some point, although I wouldn’t put money on him turning up in the Season 7 premiere.
Hopefully the Season 7 premieres drops an explanation about what happened to Antonio that he’s no longer part of the unit.
At this point, I’m just hoping he wasn’t killed off off-screen!