Rebounding in itself is not the concern. the concern is offensive rebounding where UConn is losing the battle (37/66). That means that opponents are getting more shot attempts (250/220). BU shot only 33% in the first half, UConn shot 50%, yet BU was down only 5 points. UConn has got to do a better job on the boards or they will consistently have to have 15 to 20 point leads to overcome the fact that they are allowing opponents to get two and three shots each time down. Of course, having such big leads isn't feasible and Ollie knows this. It seems that whenever a team goes into a zone, UConn loses poise- whether it's throwing the ball away (Kromah), or putting up hasty/ill-advised shots (Calhoun/Napier). So far what I've seen in the first half is UConn starting out poised and letting the game come to them- hitting the open or hot hand which builds leads, and then losing poise, perception and court awareness, which makes the team blow leads and have to claw their way back.
It's early in the season and they will have to work on these areas. However, they must limit opponents to one shot which will allow their transition game to get rolling and not allow opponents to get back to a zone defense.