What we do remember from 2009 can be boiled down to "you don't mess w/success." I.e., 18 straight games, first half of the season blowing out opponents.
What we do not remember it that it became progressively harder to just play pitch n catch.
The moral of that story in part was that we could not gut out that one vitally important win... and that in retrospect we came closer more often to other losses later in the season as weather became a factor and defenses adjusted.
To your point: don't compare 09 to 07, compare it to 08. I'd put Brady at about where Cassel got to be a few games into the season, at the present. He's not back, they know he's not back, other teams know he's not back. But everybody knows he COULD get the rust off any given week, if it "just clicks".
So to answer the question, I believe that you are obliquely correct, that BB is installing the offense he prefers. That means the offense most likely to win in any given game, or succeed in any given situation. That's really his hallmark, not any particular run/pass mix. He's in New England and he knows it, defensive pedigree be damned. He'll never fool himself into thinking that 3 yards and a cloud of dust is the reality of today's NFL.
I'm thinking that Comparatively Unfragile Fred gives us reliability in the backfield that's been missing far too often and that's a valuable tool. Maroney's got this infuriating habit of coming out w/5 yards per carry, but kicking you in the nuts and getting you 1 or 2 when you need him to get you 3. (Oh yeah and of course he's made of glass.) He plays a role but I think what we're seeing is he's been consigned to a role, not to an "every down" capability, ever.
I'm wrong about a bunch of stuff and this may fall into that category... but I think given all the tools, BB will still not have very similar game plans game over game, based on opponents. Settle into an idea of those tendencies one direction or the other and he'll look for what you're trying to beat him with. My thought is he's the opposite of the coach that says "we'll do what we do best and dare them to stop us." He might say "UNTIL they stop us," as he did in 07, but that "until" did begin to happen later in the season, and finally happened in the SB.
With the right QB (sarcasm intended here, I mean w/a fully "back" Brady,) there'll be more of an air game.
PFnV