From looking at stats, Grayson is for sure a run first Spread Back. In the two seasons I can find stats on him, This year and last, His avg season looks like this.
15.5 Passing TDs 0 Ints, 943 Passing Yards, 1970.5 Rushing Yards, 42.5 Rush TDs, 418 Rec Yds 11.5 Rec TDs, 56 Tackles 3.5 Ints
TE
57.5 Passing TDs, N/A Ints, 2715.25 Pass Yds, 1137.75 Rush Yds, 24.75 Rush Td's, N/A RectYds, N/A Rec Tds, 77 Tackles, 6.5 Ints
Not having GR play a Senior season at this point Id say the Following
Passing goes to TE
Rushing goes to GR
Receiving goes to GR
Defense goes to TE.
Even more summary
TE 82.25 APTD 3853 APYDS
GR 69.5 APTD 3331 APYDS
I also think some of these numbers will go up his Senior year.
I think GR is a more complete player and is involved in Every Facet of the game, where as TE is more of a traditional Early 2000s Spread Back where he will Throw it 75% of the time, and other than that will run the ball. He was a Solid DB as well. GR is a far superior runner and is a much more physical threat. He is also involved as a receiver as well. GR can line up anywhere on the field and make you better at that position.