I did one of these in the pitching thread, and thought one might work here as well.
This is a snapshot comparison from the opening day roster to today, not a complete record of ups and downs.
* is LHH,
Bold is opening day roster, call-up replacements are indented, whether originally on the roster or not.
Catchers:
Wong
McGuire*
Infielders:
Triston Casas*
Enmanuel Valdez*
note: Vaughn Grissom IL/Delayed ST, rehabbing AAA, 14 days left.
Trevor Story (60 day IL 4/6, shoulder, out for year)
David Hamilton*
Rafael Devers*
Pablo Reyes
Romy Gonzalez (10 Day IL 4/13 wrist sprain)
Bobby Dalbec
Outfielders:
Masataka Yoshida*
Tyler O'Neill (7 Day IL 4/16, concussion)
Rob Refsnyder
Wilyer Abreu*
Jarren Duran*
Ceddanne Rafaela
Minors (40 man)
Tyler Heineman - Catcher (WOR)
There's currently a Bobby Dalbec discussion in the thread of that name. I'd rather not blindly replicate it here, but it seems that with Grissom or Gonzalez coming back, an IF decision will be made.
OF is a bit trickier. The pros and cons of Refsnyder have already been fully fleshed out, and the main question is which of the OFs might be sent down? Abreu has started cold but has seemed to come on recently. Rafaela's current approach with the bat is not good, and he's logged 3 errors in CF. So it may come down to a "who needs a head-clearing stretch at AAA" concern at the end of the day. But that kind of decision is still several days out (at least.)