He was most likely exposed to the E-P system with Savannah at Michigan State (where he also met Josh McDaniels), and continued at LSU.
Then he went to Detroit, then San Francisco, then Denver with McDaniels, then Denver with Manning.
OB started at Brown, then Georgia Tech, then New England, then Penn State. Since it's New England before going to Penn State we assume his preference is E-P.
Well, how do we know Gase's preference isn't what Martz was doing?
Judging by what we've seen the last couple of years, I wonder how much E-P we're using. & if Gase is as innovative as... I just think it may be presumptuous of us to assume he has a foundation in E-P.