Time will tell...however, I'm not as worried about rebounding as I am about our opponents having a higher shooting percentage against us. Stewies blocks, altered shots and mere presence took power forwards out of their game. As to rebounding, Gabby, Collier and Butler all had more rebounds per 40 minutes of play than either Stewie or Tuck. Granted some of that was garbage time but with their increased minutes I really don't see rebounding as a problem.
Overall I'm okay with our rebounding but for the games we lose I think it will be a good chance that we get whacked there amongst other things. We'll be a tough team to beat but when we go down I think that will be an issue at times.
I don't think NB gets big minutes overall. She'll get minutes but not big minutes. And I didn't think she is that good of a rebounder. I think a lot of Gabby/Collier/Butter's rebounding had to do with as you say - their competition and even when they played with the 1st string, the defense of the other team wasn't worried of Gabby or Collier's offensive rebounding as much as defending Stewie and Tuck everywhere on the floor. Now they'll have the top inside more physical player's guarding them (KLS will be defended by more of a quick player. In some cases it will be tall, but not a rebounding type bulkier defender.). The good teams that are capable of beating us- it's not like all of their big player's can't defend at all outside of 10 feet.
And on defense, Tuck would guard the wide, bulky post and Stewie would guard anyone very long. Gabby or Collier weren't guarding as tough of an offensive threat around the basket overall as Tuck would, or as you say Stewie would rover around and at least alter shots or Stewie's ability to help-and-recover-and-compete for rebounds was 2nd to none . When Stewie altered shots, she wasn't in as good rebounding position so to compare them vs her while also adding up the competition, I wouldn't give them much for the rebounding per minute. Her ability to help and recover and compete for rebounds, now with her gone, anytime one of our backline does that, we'll be much more exposed in terms of rebounding too.
Overall I don't believe NB is that good of a rebounder. I hope I'm wrong. Overall I think KLS is soft as a rebounder. I hope I'm wrong. As far as KLS/NC/GW - last year if they committed quick fouls, so what? Now - they can't commit 2 fouls early or if they are in foul trouble 2nd half can't be as aggressive. They haven't had to live with that in their college careers. Now they do. Much more they have to pace themselves and realize their presence is very important too.