The most innovative thing Greg Davis did at Texas was the change when Irby got hurt in 2008. He promoted the switch from a pro-style zone offense to an all-out spread with Dan Buckner and Jordan Shipley taking the majority of the "2nd slot man" snaps. Having no Jamaal Charles also made it a lot easier, since he wasn't tempted to try to zone read every play.
Irby got hurt on his 2nd catch against Rice. We played around with Peter Ullman and Ian Harris at TE against Arkansas in a semi-meaningless easy win. Then Greg Smith against Colorado in the boring road game blowout. It was kind of obvious that the TE personnel wasn't going to give us the edge against #1 OU the following game, especially with Ryan Reynolds playing LB. So he straight-up ditched it. Ullman and Smith got like a series each, and when it was obvious that we weren't getting any help, the role of the TE disappeared except in some short yardage and nontraditional sets. And when we won, we rolled with those sets for most of the rest of the season.
Oddly enough, the Tech game was where we tried to resurrect a lot of TE stuff in the first half when nothing was working.
I think replacing Brewer with one of the bigger WRs isn't the worst idea ever. I don't think Warren is what we need playing out there.