A few scnerios that could happen off the top of my head involving CC, SS, and Lex winning the region (not all of them):
CC and Lexington wins out, Lexington wins region (duh).
CC wins out, Lex beats McN, loses to SS, Lex win region
CC wins out, Lex loses both, CC wins region
SS wins out, SS wins region
Not trying to sight McNairy, I just haven't looked (or figured out through posting) their schedule besdies Lexington Friday night.
Basically, if Lexington and CC win Friday night, Lexington wins the region.