It will be interesting to see where he is drafted. He could be great or he could cost a GM his job.
If he is drafted in NFL high enough where a bust costs a GM their job, he'll have pocketed $15M+ and be taking batting practice by age 25.
NFL first or second round draft pick is more up front money than initial MiLB contract. If he succeeds as an NFL quarterback he'll make in excess of $100M.
He'd start baseball with his bonus and initial contract and need about 3-5 years between minors, rookie contract, restricted FA and unrestricted FA to see $100M.
His only way of screwing this up is to be drafted low in football, stick with football, flame out in football, shift to baseball and flame out there too.