Bigs are going to collect fouls, it goes with the territory. This is especially true for bigs playing behind poor defensive guards that allow for increased traffic at the rim. Amir had a lot last year, but his fouls, from what I saw, were more about him covering too much ground rather than being out of position. In his early years, he would be in the wrong position and overcompensate and thus foul. Last year he had much better defensive positioning, but the team defence wasn't very good, so he had to cover too much ground and would often be 'late' because of it. Not worried about it for this season.