My guess it has multiple reasons. If Mateer jumps, Eckhaus will preserve a year of eligibility. If Mateer gets hurt this year I could see Eckhaus playing the last four games and still preserve that eligibility. And I could see Eckhaus stating he was going to jump into teh portal and if our coaches are smart would say no not yet, you will be the last to be offered anyway, so see what plays out.
What I will say for just throwing the ball, Potter has a great release and the ball gets to where it needs to go in a hurry. The question will be how does he adjust to being a QB and against a pass rush