Doing his diligence and getting that quote out of Lawrence's family would be great work by the scout. Feather in his cap for sure, as I didn't recall hearing that with Lawrence. But Lawrence just had his best season. So what happens if he goes on to a top career over the next decade which is possible. Much is still TBD.
Funny thing about Mendoza is my biggest criticism of him is he is a fuckin dork. He reminds me a little of Payton Manning, smart kid who is gonna stop at nothing in terms of doing the work. Manning also had the size you want with a "good enough" arm. Mendoza is a better athlete though, stronger too, and can get you yards when he needs them on the ground.
I think if you're expecting Mendoza to bust you're in for a painful ride. Granted the Raiders could fuck up a wet dream. But if they take Mendoza their fortunes are going to change, at least on offense, because he's gonna live in the film room and bust his ass to improve like Payton did.