I always look at the QB position a little deeper than the others. To me, the QB IS the coach on the field, responsible for getting the play called, getting everyone in the right position and then executing that play. The QB is the leader on the field. Call me biased!! I played that position and then coached it in HS. The QB is to be the ONLY voice in the huddle/when they huddle. He must be a fierce competitor yet remain as the late Stuart Scott would say “As cool as the other side of the pillow!”
Does Jalen have his faults/limitations? Yes! He isn’t as polished as some others we have seen before, Tua and Bryce come to mind. He is a lot like Jalen Hurts. Difference in the two was at least Kiffin was willing to work with him while O’Brien basically sent Milroe to go fetch water or something. Where Hurts used to always make one read then bail to his right, Milroe is missing the pre snap read of “cat blitz/hot receiver” or potential coverage looks- revealing the holes for receivers and then those in play reads of getting off of 1 or 2 quickly enough.
Finally, I don’t see why this wouldn’t be an open competition at QB and for that matter, all of the other positions. This staff will have to learn all of these guys that are on the roster and their capabilities and limitations. Could Milroe be unseated? Sure! He can struggle with the playbook and/or he can assume he already has the position won and not give the desired effort wanted by Grubb and DeBoer.