Hamlin and Garner are very, very good, with a little drop off to Swann, Jones, Frerotte, and other kids. Also, Ron George does a nice job as a LB/cover guy. They are much bigger and more physical than you would expect for DB's - particularly Hamlin, Garner, and George. But none of them are 6'5" - probably closer to 6'2 max.
I think the key to the game is the Parkland QB - if he can run a little and spread them out, they will have a chance. If he is bothered significantly by his injury, they will be in a tough spot unless he can complete 65-70% of his passes with a couple TD's and no TO's. If they try and pound PCC, they will lose - must spread them out and not let them stack the box, and take shots.