I am firmly in the Spread Offense camp, with the right coordinator and a program commitment to that vision. I agree with you, we have not had that.
What's interesting to me is that the "12" personnel was developed as a tactic to counter defenses that drop 8 men into the gaps along the O line to stop the run. This happens routinely to SU. The use of an extra TE on the line takes away that advantage from the D, in theory anyway. So, IF the O line can control the line of scrimmage, there is the potential for big plays from the run game. Big if.
The "12" personnel will give Lester the ability to run a variety of base and spread formations without sending in different personnel or tipping off the D prior to breaking the huddle.
The problem with the 12 is that you need to have an H-back who is equally effective as the 2nd TE, a 3rd WR and, to a lesser extent, as a 2nd RB or full back to fully utilize what the 12 can do. That H back needs to be an effective blocking TE on the edge (going up against DEs and SAMs) and just as good as the 3rd WR who would have been used on the field in 3 WR sets. The 2nd TE can also be split out, and the RB can be motioned out as a WR to give a full 5 WR spread look.
A lot of faith is being placed in finding those H back types (Trey D?) AND in Lester's ability to maximize play calling through use of various formations to counter the disparity in talent that O will routinely face.