Well, first of all, we have to keep in mind that the transfer portal does not offer unlimited options. There are only going to be a handful of quality big men in there every year, and it's very easy to overrate the talent in the portal because when teams are desperate for talent, everyone looks good. Tilly is a good player, I'm glad OSU got him, but we'll have to see just how good of an addition he proves to be. OSU clearly has a skillset they want in their bigs, they want guys who can face the basket, stand beyond the 3-point arc, be a threat to shoot the 3, and pull opposing bigs out of the paint so they can run the hi-low & have other guys be able to cut to the basket and get easy opportunities. Clearly Tilly's skillset gives them a strategic piece to their offense. He certainly has some skills at passing and dribbling that you don't see in a lot of taller players.
The concern I have is defense - is Tilly going to be able to stop a big like Vlad Goldin 1-on-1 when he tries to push around the defender to get to his spots? It's hard for me to say yes to that. OSU needs to have somebody who can be the backbone of the defense, be the stopper in the post and clean the glass. It seems to me that they are planning to do that by committee, so by saying it's everyone's role, it's really no one's role.
I wonder, is OSU done adding to the 4-5 spots? Obviously Ivan and Tilly are 5s, while Stewart and Bynum are like 4/5 tweeners who probably will see significant time at the 5 but could see minutes at the 4 as needed. Royal will start at the 4. I am still hopeful we get a defensive stopper for the post, but starting to lose hope there & it could be that OSU is hoping Ivan can develop into that to an extent. I believe they are going to look to add a starting wing player to fill the role that Micah Parrish had this past season & that may be the one last big addition to this team for next season (assuming Bruce comes back).