I was a little surprised to see the 7 man rotation, but that could be due to having a full week to let the guys rest before the next game. Davis must really be in Marlin's doghouse, I thought he would getting a few more minutes to help out with the loss of Gant. He played fairly well Thursday night but he didn't see the floor tonight along with Hardy. It is somewhat concerning since he has already announced he was transferring once and had to be talked into staying, I think he will be needed next year.
As far as replacing Washington I think Miller steps into that spot and does the best he can. Justin is probably a better rebounder that you think. He is 2nd to Bryce in rebounds per minute and you will probably see an up tick there once Bryce graduates simply because he won't have to battle him for boards (same reason Bryce's numbers increased after Long was done).
Also Elijah McCoy is red shirting but I think he is more of a project than a proven commodity waiting in the wings. I think Gladney will be more like Gant than Washington, an "athletic" forward rather than a true power forward. I don't think the cupboard is bare but Bryce is a special player that won't be easy to replace.