IMO, I think people get too hung up between the 4-3 and 3-4. Chins runs a 4 man front often and he has said he does depending on the team. Yes, you need an extra LB in the 3-4 or an extra lineman in the 4-3 so which is easier to recruit? I say a LB but lots of teams seem to be able to find and develop them. There really isn't a 3 man front in the 3-4, there is generally (hesitate to say always) a LB on the edge, sometimes more than one.
In the old days of the 5-2 and 4-3 we often had the DE drop off in pass coverage. In this day and age with the spreads, teams need more speed on the back side to match the speed of the offense, thus the 4-2-5.
Personally, I could care less what you call it, I am more concerned with the results and so far they have not been anything worth crowing about.