That's what I was thinking when they put him in. I forget the exact situation, but it was a close game and we really could have used the run.
He already looked shell shocked being up in the majors. Why put the pressure on him like that. Heck, a seasoned vet would feel pressure to do something in that situation.
Moncada came up and blew it. It's not like everyone in the world hasn't had a chance to prove themselves, blew it, it snowballed out of control, and walked away saying "damn, I'm better than that".
What we saw from him so far means very little I believe. He got a good look at a MLB curve, and now knows a little more about himself than he did before.