I'm with you on the "short leash" position. Hell, I wanted him demoted to work on his swing a few weeks ago.
Being in a tight playoff race changes the dynamic, but not really the idea that he may need time to get into a groove. (Maybe there is no groove to get into, and Dalbec is no better than Middy was.)
Some of us have mentioned a platoon, but since Dalbec is on the short end of the platoon, he really would not get an opportunity to work through his issues by playing nearly everyday. While this might be the best solution to the team's needs (use Marwin, Kike or trade for a Moreland type at 1B), it just prolongs and cloudies the decision on Dalbec's future.
Do we really want to start all over with him, next year? Can we afford to watch him struggle for 200+ PAs, next year, too- only to end up realizing he's not a keeper?
I'm not advocating tanking the 2021 season just to find out what Dalbec (and others, by the way) can or cannot do at the ML level, and in some ways, winning so much has made that aspect of the season very problematic for Bloom and Cora.
In theory, we may call up Duran, soon, and let Kike or Marwin play 1B vs most RHPs. That may ultimately be the best choice, for now.
I do NOT see Casas as a 2021 solution. It's either Dalbec-Kike-Marwin or a low key, rental trade for someone like Moreland.
Dalbec's poor defense has not helped his case, either.