I must say that Eddie is right regarding Rakeem Christmas and his age.
It's not an uncommon thing that older players are dominating in the NCAA, where the competition mostly consists of young players between the age of 18-21 years. Rakeem had an easy time last year given that his body was more mature compared to the players he was facing hence that he easily scored a lot of points.
I'm not saying that he is bad, but he is basically a case of "what you see is what you get" like Eddie pointed out too. With that being said don't expect him to get much better than he is right now.
Look I know being older is a minus. But we are not talking about a Luke Harongody like prospect here. A guy that had a good college career, but has very little transferable skills and worse has almost non existant athleticism/quickness to hang even with the worse nba players.
Christmas in terms of size, length, explosiveness is at the top level in comparison to other nba pfs already. Also good weight at 245 pounds.
Skillwise, his post skills are impressive. Will he be able to do what he did in college in the NBA? likely not at will but his running hook, faceup and dribble past slower guys should translate. Add a mid range J now. His defense or what he has learned from playing zone D is a concern but can be reworked (especially considering his physical tools). He graduated with good marks and is known as a hard worker
When I add all of these things minus age , this is still a solid prospect imo.