You want to see how close that edge is, look at the ACC stats.
GT 39.8% FG, 31.8% 3FG, 70.1% FT, 148 Assts 157 TO, +5.2 RB margin, 62.2 ppg
CL 38.9% FG, 31.9% 3FG, 65.7% FT, 134 assts, 133 TO, +2.3 RB margin, 59.0 ppg
Defense
GT 43.8% FG, 34.1% 3FG, 68.3% FT, 175 assts ,143 TO, 64.8 PPG
CL 38.5% FG 33.2% 3FG, 68.9% FT, 139 assts, 128 TO, 58.5 PPG
The teams are almost identical on offense, GT rebounds a little more but that is basically it.
Clemson is a little better defensive team and that has allowed them to win 5 more games.
GT could easily be 7-6 in the ACC like Clemson and isn't simply because of about 1 possession a game.