"he will run a 4-3 defense - since we are light on LB's it will probably be easier to find personnel for this scheme"
Its also easier to get pressure and therefore cover better out of a 43. If you look at it, Tn finished near the bottom nationally in sacks...and before someone says "Bama is doin fine in a 34.", they too had a hard time getting to the QB this year, and thats with top recruits filling the roster and Saban calling the blitzes. Theres a reason why more teams like to run it in the NFL than CF. Its a great system, but you have to have a solid group on the field that can run it.