I think Bernardeschi will play as an attacking midfielder rather than on the flank.
On the subject of Juventus hoarding talents, the truth is that they're all there for the taking. No one was interested in Dybala outside of Italy and no one seems interested in Bernardeschi either despite him being a better talent than any of those young kids Monaco have unearthed, bar Mbappe. I have no idea why this is the case, but you can't blame them for moving on players that the rest of Europe for some reason or other don't seem to want.