If the team feels that Romero and Gonsalves are long-term rotation pieces, then this April (before Santana returns and if they don't add anyone new by FA or trade) might be a perfect time to get their feet wet and see how they perform. You'll recall that Berrios, even with his sparkling AAA stats, bounced back and forth a bit before he found his footing in the majors. If either of these two guys take off, we'll forget about signing outside help, and if not, they can go back down for some more seasoning and prepare for a late-season call-up.
Frankly, I'd rather do that, knowing that they'll probably be on a short leash, than take the Terry Ryan approach of waiting until after June 1 before calling these guys up just so they don't reach Super Two status, assuming that they'll stick and not have to go back down.
Right, Berrios struggled mightily in the majors even with sparkly AAA stats. So Romero and Gonsalves are different and do well in the majors with no AAA experience to think of?
I don't think some realize how huge of an ask it is to jump from AA to MLB as a pitcher.