7.6 was his career average, as you (or someone, I don't remember) said he was "a career 7 yard passer" or something like that. I was just correcting his career number. Yes, 7.8 was for 2018.
"Total" anything is a pretty garbage statistic. They have weak correlations to winning/losing. For a qb, it ignores run/pass ratios, attempts, tempo, and how your run game is helping/hurting. JG had to deal with having the worst rushing offense in the SEC. It's not that curious why he didn't get many TD opportunities. Defense wasn't a great help either, though not a complete hindrance.
You are going to judge him on total passing yards, yet he had the fewest attempts in the league. See how little sense that makes?
YPA is at least a better starting point (higher correlation to winning). From there you can go further into QBR and advanced stats, such as S&P+, taking into account opponents and tempo. Total yard stats were left for newspaper writers and casual fans well over a decade ago.