Well they've pretty much been wrong on most of those counts. Maybe he does have a hole in his swing, but maybe it's nowhere near as pronounced as scouts have said it is.
Adam Dunn is probably a pretty good comp for him, Dunn put up a .288/.404/.424 slash line in the same league at the same age. Dunn also made lots of contact in the minors and looked like he would hit for a much better average in the majors than he has done.
It is just the start though and rookie league ball, so expectations do need to be tempered.