Interesting comparison to Hurts and Jackson. Two guys who were definitely not natural pocket passers and not necessarily pass first QBs, particularly in their first season or so of being starting quarterbacks in college. Hurts didn't look comfortable in the pocket as a starter until he got to Oklahoma. Yes, I recognize in 2018 he looked much better but he was not a starter. Jackson, whose college completion % was under 60%, didn't become a true pass first QB until his 2nd or 3rd year in the NFL.
The point is that it's unreasonable to think that Milroe was going to to be a great pocket QB last year, and he definitely wasn't, but it doesn't mean he won't get much better at it. I don't think O'Brien did much, if any, development with him, and Rees only had a year with him. Now he has a year of starting under his belt, and some of the best offensive coaching in the game teaching him.
On a side note, I started watching the 2023 season and I'm through the A&M game. McLaughlin's snapping was really bad. Every week there were multiple snapping problems, and not just errant snaps, but hesitations with snapping as well. I know this has been discussed ad nauseam, but that's just one more thing that Milroe had to think about.