Any he can get.
I would point out that if a team wanted him as a head coach, he would be a Head Coaching candidate. I agree he would be a bit of a dark horse, but most of the teams this year looking for a new HC might consider him.
Ex. CONVERSATION:
Desperate Team owner trying to sound knowledgeable:
What have you done in your career that would make us believe you could be a HC?
O'Shea:
AS their OC, I got the 2019 Dolphin Offense to beat New England at New England in the last game of the year, killing their Bye in the playoffs, even though we were considered the laughingstock of the league!
Desperate Team owner demonstrating great wisdom and decisiveness:
Your hired.
O'Shea:
Thank You Mr. Jones.