The SEC "dominance" can be attributed to three people.
Nick Saban: He built the 2007 LSU championship team and frankly their entire program, and then went to Bama after a year and built them into a 3 time champ and perennial contender.
Urban Meyer: He came to a middling UF team and won a billion games quickly including two titles.
Cam Newton's dad: Auctioned his son off like a slave to the highest bidder, and Auburn ponied up.
That is the entirety of the "7 in a row" nonsense. Everything else is riding off coattails, and it's spiraled out of control.
Les Miles was in his 3rd season at LSU when he took them to a title. He took them again in his 7th year. What that also only because of Saban?