I think your stats were not apples to apples. At the time of your post Nebraska had played 3 games and RU had played 2 games: So total minutes (and therefore totals of any counting stats as well) are irrelevant. I am not convinced you were accurate anyway, even with that irrelevant comparison.
BUT ... as of this afternoon: After Nebraska's 4 games (recent loss to St. Mary's included), and RU's win over Monmouth - again, reminder, GG has 4 games and Hayes just 3 games:
Total Minutes: Hayes 70 (in 3 games), GG 64 (in 4 games)
Minutes per game: Hayes 23.3, GG 14
Points: Hayes 28, GG 15
Points per game: Hayes 9.3, GG 3.8
Rebounds: Hayes 14, GG 10
Reb per game: Hayes 4.7, GG 2.5
3-point FG: Hayes 6, GG 3
3-point FG%: Hayes 54.5%, GG 25%
Overall FG%: Hayes 60%, GG 40%
Assists per game: Hayes 2.0, GG 1.3
Just saying ... no comparison.
Bottom line, though we are not certain it is sustainable, or that Hayes can do the same against higher level competition, Hayes is playing EXACTLY the material role RU wants and needs from him, at the efficiency and quality RU wanted and needed ... and Griffiths did NOT do so last year - and Griffiths is not playing a material role THIS season for Nebraska.