A whole bunch of guys got called up last year, but haven’t established their role long term. I’m interested to see a couple arms get a shot in the rotation as a depth piece like Merryweather, Kay, and Hatch. Or whether Kirk will be the primary catcher/dh moving forward.
In terms to the guys you mentioned, it’s very difficult to see either Martin or Groshans in 2021 with neither having any extensive time in full season ball. Both of them would have to rake in double-A just to get a chance as a September call-up. I personally think Martin is the best third baseman in the farm (defensively + bat) and it’s not really close. Groshans has monster power but his hit tool and glove are still developing.
Manoah and Simeon doesn’t have any track record in double-A and they are most likely not getting fast tracked through the BP. The transition to double-A is often a difficult one for pitching prospects. I wouldn’t rule it out, but there would need to be some serious injury bug plaguing the pitching staff to go that far down the depth chart so we’d probably see Waguespack/Sopko types before them.