https://www.sbnation.com/college-football/2019/3/21/18274416/tate-martell-eligibility-waiver-miamiBelow is the only thing I can find re Gatewood eligibility from Rowland:
"UK will work to get him eligible next year per what I and @Trav_Graf have both heard. Whether he can or can't, QB room's future got a lot better today."
Great article on how Martell got a waiver to play at Miami this year. Explains the criteria for getting a waiver. Long story short, Auburn needs to go along with it (which prob won't happen).