Your perspective is interesting and imo in opposition to the reasoning the SEC has been lauded by the majority of the media as the premier conference over the last dozen years.
The problem is such arguments
start with a conclusion, and then find "facts" to support the conclusion.
WF beating Ole Miss proves nothing about the SEC. Ole Miss beating a top 5 SEC team the same year proves that the SEC is so deep that winning any conference game is tougher than any other conference.
The SEC is the most powerful(supposedly) because of: Power of the top teams, depth top-to-bottom, OOC record(against trash schedules), Bowl record, SEC "speed"(don't know how that is measured), Number of teams in the pre-season top 10, various others, and now strength of bottom 4 teams.
UGA is going to win the MNC because: They are ranked #1 preseason and even the voters believe they are the best team. Then the next year being something like #7 preseason is proof, because "everybody" knows that being ranked #1 is too much pressure and being ranked just out of the top 5 is the perfect position to win the MNC.
I think such discussions are meaningless trash talk. People believe they use "facts", but they subjectively pull only very small numbers of "facts" that would support their subjective belief and ignore all others, even ones that they used before in the same argument. I don't pay much attention to "best" team or "best" conference talk, but I don't remember ANY person establishing a metric to measure the "best" conference and using it repeatedly.