Running the air raid without leach would be dumb, and would be getting an interim OC with a one year deal which would be extra dumb.
We were best last year when we ran the ball 25+ times. We needed to switch to a more up to date air raid (see Riley at USC). We got a good young OC with free rein to run his system. It doesn't fit will perfectly, but Will is good enough to run it.
Ideally, we need a mobile QB that can make the throws, but doesn't everyone?
Also, from what i have seen and read about Barbay's system, it fits the talent in Mississippi. Leach needed QB's from out of state that ran his air raid in HS ( like most of texas HS's) with Leach, he could get them because the was a GOD in texas HS football.