I do believe the SEC has more talent, top to bottom, than any league, with especially a good deal of talent stocked on the top 5 or 6 elite teams. But the challenges are two-fold:
1. The avalanche of talented SEC players turning pro early. So many more players seem to be turning pro than did so 6 or 8 years ago. It's obviously a function of the money, greater TV exposure, better coaching/player development, and the concentration of talent in the SEC. What you wind up with is talented rosters like ours, LSU, Georgia, South Carolina, and even Auburn and A&M stocked with elite recruits, but the early departures make teams rely on younger players. That leads to experience and chemistry issues that can derail a team. It levels the playing field with teams that are marginally less talented, yet more experienced and game-seasoned players. It's certainly helped a team like Missouri come into this league and compete in the East, and it's helped teams from other leagues compete better with the SEC. The early departures make it seem like our team and LSU are filling major holes every year, despite top 3 recruiting classes year after year.
2. The revolutionary changes in offense (in terms of schemes, type of players used, and exploitation of the rules) that the more talented defenses haven't fully adapted to. Jess breaks this down better than I could, but it allows less talented teams with a few stud playmakers to level the playing field and compete. It has created a greater level of parity within our conference between the first-tier teams (Bama, LSU, Georgia, South Carolina, Auburn, and potentially Florida and Tennessee once they rebuild) and the second-tier (A&M, Miss State, Ole Miss, Missouri, Arkansas, etc.), and well as parity with teams from other leagues, making it harder for one team to dominate.
As for answers? I'm not sure I know for sure, other than adjusting/evolving defensive systems and placing greater emphasis and stud, game-breaking QBs, receivers, and lock-down corners.