No trouble at all, it takes a couple more SH minutes and his overall growth will be slower, but not crazy. It will depend on his WE in combination. The recent developer FAQ gives a little insight:
Q: How much does listed high school GPA and/or work ethic impact OFF/DEF IQ growth?
A: A player with a 4.0 GPA will have a multiplier roughly 14% higher than a player with a 3.0 GPA. A player with 100 work ethic will have a multiplier roughly 19% higher than a player with 50 work ethic. These factors are multiplicative, and there are other factors as well, so it is difficult to give a hard number on the impact these factors have.