Richardson had and has some major flaws as a passer. We'll see if they get fixed. That said, Napier is not a high-flying offense sort of guy. His offense is similar to the old Nick Saban Bama offense. He tries to grind out wins with a pro style offense that leans on the running game and game manager QBs. He didn't use Richardson particularly well.
The big issue with Richardson, beyond his flaws as a passer, is that while he's a freakishly gifted athlete and massive (6'4" 245), he gets hurt often. As a passer, Richardson struggles with his touch and his accuracy on short routes. He does throw deep well, though. And he has an absolute cannon for an arm. One of the issues he had at UF is that he didn't like to scramble to the left. So when you pressured him, you were confident that he would flush to the right. It was a huge tell for him. I don't know if he has fixed that issue.