I just wrote a post almost identical to yours about the Brown commitment. Last years team, all the key role players were lost to injuries. BYU's system is guard-centric and really position less when the roster allows it. You nailed it that the additions of a great athletes on the perimeter along with a pure distributor, 3 and D and spot-up shooter are more reminiscent of the Rose elite teams.
I also like that the bigs who are most likely to contribute (Childs, Andrus and Dastrup) can all really run and shoot. Of course, Mika can also do that and would be a great addition. But, I think all of those Forwards fit the system Rose wants to run. I am not nearly as confident in Shaw and Worthington. Nixon is a huge question mark but could develop into a really nice stretch 4 option.