I'm on board with saying that the R should spend up to the second cap, roughly $24M. That said, I'll throw out a couple of alternatives:
If all we add is Donovan, or say Paredes or Suarez, then not only do we have a good offense, we also have our starting lineup set. There won't be any room for additions.
The RS have a ton of payroll space next year. Regardless if fans think it's impossible, if the RS wanted to duck under this year, and sign Skubal to $400M/8 next year, I'm good with it.