What's to worry about?
I mean, most people don't catch on the first time they are called up. He looked bad in his strikeout today? Well, maybe, but most people don't look good when they strike out, and it's not like he's striking out three times a day. He's made some good contact, and if Jorge Barrosa could cool his jets a bit, things might be looking pretty differeint.
He had only 24 games at AAA (during which, he did pretty badly).
Vientos was pretty bad, and then he was very good, and then he was kinda bad again. Baty was kinda bad and then he was kinda OK. Establishing oneself is a process that can take many paths.
Maybe he will need to return to AAA, but maybe not. It is probably too soon to decide, but 43 years ago folks were having the same conversation about Darryl Strawberry. Only then, the forum was a bunch of stone tablets and shit.