I think he's good, not great. He was protected a lot by the coaches this year. They didn't ask him to do too much, and Tulane was a run first offense with Makhi Hughes. He wasn't, at least this year, someone you wanted throwing it 30-40 times a game. An ideal game was him throwing it 17-20 times and them running for 200+ yards. He will obviously play with better talent at a Miami, but it's not like Tulane had Ball State talent. Tulane had Mario Williams (from Oklahoma and USC) who almost had 1,000 yards and Yulkeith Brown from TAMU (and Miami Central). He threw 4 of his 6 INTs in games they lost, and 2 at times when they could have tied or gone ahead (K-State, Oklahoma, Memphis, Army). He can scramble. He's not a running QB. He frustrated me like Ward at the beginning of the year when he refused to scramble even when he had 10-20 yards of open space. He did a much better job at the end of the year of scrambling when it was there. He throws a nice deep ball, and did have some throws into tight spaces where you said, "Wow, this guy is a freshman?" A lot of his completions on middle range outs or crossing stuff were WIDE OPEN because Rice, UAB and Charlotte DB's looked like FCS guys trying to cover Tulane WRs.
I think he can develop into a solid QB, but he's more of a Michael Pratt than a Cam Ward (I know there's no other Cam Ward, I just meant style of play). I honestly have no idea how he would do in a pass first offense. One other thing that would give me pause, are some of the stories that I've heard of how he handled his departure from Tulane. He was supposed to have a meeting with Tulane's NIL collective (as did all the players they thought were flight risks). He kept putting them off saying he was concentrating on the AAC Championship Game. It's obvious now he just didn't want to meet with them. He left the Army game in West Point with his agent, not the team. He basically cleaned out his locker in the middle of the night, and ghosted the NIL guys on the zoom. He didn't tell a single person, not even a single coach he was headed to the portal. Coach Sumrall found out when a player saw it on Mensah's agent's IG story. They were already back in California while Tulane was having a meeting to announce the bowl with Florida. Now, I've met his parents, and they seemed like wonderful people, and legitimately thankful Tulane gave him this shot (only D-I offer I believe), but his agent (works for Lil Wayne) is a scumbag, and he's being influenced by the wrong people.
All of that to say, he wouldn't be my first, second or maybe even third choice. I wouldn't be mad if ended up at Miami, but if Miami is trying to get anything close to a Cam Ward, he's not it.