It was because he'd already warmed up when it was only 4-1. It definitely puts his availability in question, could lead to an uncomfortable spot for Robertson. Or maybe even Buehler.
You wouldn't have wanted Mayza to face Betts and Hernandez even in an 8-1 game. Maybe not even Walker (with Freeman to boot) though he surely would have had the inning had the lead blown up sooner. Or Robertson might have.
Duran for five or six outs tonight probably. Luzardo would be avaiable. Nola? In 2023 Wheeler pitched two innings in Game 7 on two days rest after throwing 7 IPs. Nola didn't get much work last night but obviously isn't used to that. He and Suarez would both be available for Game 5 of course.