This.
I think that "panic move" is over stating the situation. I see it as "nothing ventured, nothing gained".
The kid has about 400 PA above high A ball.
I read the link that MVP provided and suspect he will not deal well initially with MLB breaking balls. I also wonder about his understanding of which pitches to expect in any situation, and his ability to recognize pitches thrown. Those are skills built with repetition. I suspect that unless he is some hitting savant, that he has not seen enough PA at high levels. I won't be surprised if he is ineffectual initially at the plate. AAA has more pitchers who have thrown decent curve balls ( I think, anyways ). The prudent thing would be to let him finish the MiLB season in Pawtucket. But hey, I have never seen the kid play so what the f*** do I know?
I like Marrero at third until such time a proven MLB bat can replace him. Many teams have players starting for them that have weak ( ~ .220 / .300 ) numbers and get away with it. Some of those players do not have elite fielding skills, either. Marrero plays very good defense. I don't see 3B as a drastic or crippling weakness.
Oh well.
I hope the kid hits.