And since then he's handled a very heavy workload without any problems.
Again we don't know if Haley would have kept increasing his workload as he had their first two years together. If you throw out his ACL injury his workload has increased by about right around 2 touches per game since his rookie season. No one can say if Haley had the same plan to continue to grow his workload like he has since he arrived.
Other than he's certainly played without any problems but he also had his 2 best YPC seasons under Haley,3 if you count the AC year which I don't.
Lastly Charles second best season for total yards was his last season with Haley. That season he only finished 45 yards away from what he did last season and on 54 less touches.
This idea Haley mis-used Charles is nothing more than a myth. Fact is he used him in a way that got maximum efficiency.