Key 2020 Losses (all OHC players):
Catholic Central: Ryan Ewing (WR/S), Colby Zeller (OL/DL)
Cedarville: Colby Cross (WR/DB), Wes Wickline (OL/DE)
Fairbanks: Dakota Key (OL/DL), Sam Rengert (OL/DL), Braxton Wilhelm (QB/DB), Gatlin Luke (WR/DB)
Greeneview: Clay Payton (RB/LB), Nick Wolfe (OL/DL), Michael Hanson (OL/LB)
Greenon: Dylan Bardnell (OL/DL), Luke Downing (WR/DB)
Madison Plains: Ethan Hill (OL/DL), Jarrett Vallery (QB/DB), Matt Holbrook (OL/DL), Parker Wright (OL/DL)
Mechanicsburg: Kix Thiel (TE/DL), Logan Hurst (QB/DB), Noah Wolf (WR/LB), Mack Delong (WR/SS)
Northeastern: Codey Taylor (OL/LB)
Southeastern: Tucker Eriksen (WR/DB), Hayden Mckee (RB/LB), Austin Sanders (WR/DB), Emerson Severt (OL/LB)
Triad: Logan McCoy (WR/DB), Jordan Simonelli (QB/LB)
West Jefferson: Gabe Jones (RB/DB)*, Shane Bumgardner (OL/DL), Cory Hart (OL/DL), Brenton Robertson (OL/DL)
West Liberty-Salem: Isaac Lee (OL/DL), Holden Nease (RB/DL), Kyle Wolfe (OL/DL), Trevor Woodruff (QB/DB), Eli McGill (OL/DL), Trenton Douthwaite (WR/DB)
Key 2020 Returners (all OHC players):
Catholic Central: None
Cedarville: Kane Odon (RB/ILB), Mason Bowen (RB/DB)
Fairbanks: Braylon Green (WR/LB), Riordin Stauffer (RB/LB)
Greeneview: Ian Henry (OL/DL), Dakota Mangan (WR/LB), Jarrod Mays (FB/LB), Logan Sandlin (WR/DB)
Greenon: Cade Rice (QB/DB)*, Kameron Cox (RB/DB), Nathan Hawks (K), Bass Moore (WR/DB), Clay Hough (WR/DB), Brendon Parrett (OL/LB), Arlie Benson Jr (WR/DB)
Madison Plains: Paul Bryant (RB/DB), Ryan Ernst (WR/DB)
Mechanicsburg: Caden Coleman (OL/DL), Jake Hurst (WR/LB), Chayse Propst (RB/DL), Keith Bebout (WR/FS), Aaron Conley (QB/DB)
Northeastern: Gunnar Leonard (RB/DL)
Southeastern: Wade Eriksen (QB/DB)
Triad: None
West Jefferson: Tyler Buescher (QB/DB), Tyler Oberle (WR/DB), Dylan Lambert (RB/DL)
West Liberty-Salem: Nick Burden (WR/DB), Isaiah McGill (RB/TE/LB)
* denotes OHC Player of the Year
Looking at that, WLS and West Jefferson get hit hardest by graduation. I think West Jefferson recovers better as they have a plethora of replacements at nearly every position (even though Jones is irreplaceable). Greenon and Mechancisburg have the most returning.
North appears to be a 2-man race (Burg and West Jefferson).
I don't think anyone challenges Greenon in the south.