To be expected. I am sure he didn't see many plus changeups in AA.
He appears to be handling the learning curve just fine.
Lots of impressive things about him. He is clearly not intimidated by the moment. His reactions, and instincts at 3rd, make it hard to believe he has never played there. His arm has to be one of the strongest in the game at 3rd.
You can just see how he is going to post major numbers in the near future. He is going to crush pitchers who go outside to the RCF gap. When they come in, he is going to blast balls into the left field seats.
He's done a good job of making adjustments so far in the bigs. He figures to get a steady diet of off-speed stuff on the upcoming trip. Will be another opportunity to see what adjustments he makes.