totally agree about their frame, about their skills Holmgren is more polished, better IQ and a more complete player.
the big question is what position can he guard and his perimeter D. Other than that i think he can exist in the NBA, offcourse if he is not injury prone.
And don't forget that Bol Bol played only nine games with Oregon, we'll see if Holmgren can play all the season without being injured.( I'm not sure Holmgren had a lot of injuries during his youth)