I am not against Buchanan, he actually played the 5, in a pinch this summer for his AAU team, when they had foul trouble and is a rugged, very determined rebounder. Everyone can't be judged strictly and exclusively on whether he can shoot a 3 pointer. If the player is a A, or A+ rebounder on both ends, you probably can develop the other aspects of shooting.
Some players that are shooters, are afraid of contact and the dirty work necessary to get tough rebounding position. I think Pike and the staff like to coach up kids to become better defenders and hit the glass, but this kid eats glass, full time.
If Mawot Mag sticks and develops, and Aundre Hyatt is what I think he will be for RU, I am not sure you need another similarly sized rebounder. If Mag isn't durable or capable of being that defender or rebounder, then you need Buchanan or someone similar in recruiting for 2023 etc.