One good thing is that he graduates this spring so he can take one online course a semester for the rest of his college career and make football his full time job just as Joe did, If he has the work ethic and intelligence to gain a total grasp of the offense we just might see something that would amaze us if we already hadn't been totally amazed out by Burrow.
He's in many ways ahead of schedule from when Joe landed on campus in 2018. He's gonna hit the ground running, I have no doubt.
Technically, you need to take six hours (two courses) to be considered a full time graduate student. But, you are right. He will certainly have the time to do the film work, etc. if he chooses to do so.
I had read in several places that Joe was only taking one course per semester. Maybe there is a 6 hour course. Like an upper level course on Reading and Reacting to changing defenses. Lab work to be done on the practice field. Textbook by Joe Brady.