In any case, they seem ready to have Hoskins, Bohm and JT in the RH DH mix, which means Castellanos is firmly still the starting RF until Bryce returns. Would they play Guthrie in RF once a week? Or give Nick a day off against RHP if Cave (or Clemens) win a spot? Clemens can also play 3B but Sosa would be ahead of him there. Turner could also DH once a week to get Sosa at SS.
Regardless, Kingery is well down the depth chart, but I think comparing him to Cesar only proves the point. If all you're gonna get is an 83 or 84 OPS+ it could be literally anyone, and Kingery is both under contract and offers flexibility (whereas someone like Cesar would either have an opt-out or would get claimed).
Hall vs. someone who can field for the 5th spot strikes me as the main battle. Guthrie vs. the other guys for the fourth spot is less of one, any of them will do. If they make that small deal it's probably at Hall's expense.