Carolina won the East in 2010, by the way. And while it's true winning the division with 3 wins was unprecedented and hasn't been repeated, it's hardly backing into winning it when you actually look at the schedule. The 2010 team beat Georgia, Tennessee, Florida, and Vanderbilt in the division, only losing to Kentucky in upset fashion in division matchups. If you beat the vast majority of teams in your division, you've earned that title. It also beat #1 Alabama, still one of the biggest wins in school history. The other two losses were to future national champion Auburn and Arkansas.
I assume you don't say Georgia and Missouri backed into winning the East in 2011, 2012, and 2013 despite each of those teams losing to South Carolina all three years?
Taking your math for correct, Spurrier averaging 8.4 wins at South Carolina is really good. It had never been done before, and still hasn't been done since. I'm not sure why you're acting like Spurrier's tenure here wasn't good.