It could have been any number of combinations.
Alabama vs Georgia (bordering states, both big-boy programs)
Auburn vs Florida
LSU vs Tennessee
There's nothing wrong with these.
Here's SEC records from 1970-1991:
.798 Alabama
.688 Georgia
.607 Auburn
.581 Tennessee
.568 Florida
.559 LSU
.402 Ole Miss
.309 Miss State
.307 Kentucky
.169 Vandy
.
So 1 just has to play 4, and 2 must play 3, or else they'll pitch a fit. The other matchups?
5 vs 6, 7 vs 10, 8 vs 9. Basically random.