Here's the thing. When he is on the move and a receiver gets open, Fields is very accurate. We've seen him "throw guys open" on a number of occasions. What that should tell anyone with a brain and a pulse is that the SKILLSET is there. We've seen him stay even-keeled and not disintegrate after the beatings he's taking. Tells you his MINDSET is there.
The rest of what we are seeing can be explained by a rookie doing what he is being told to do by a head coach and oc who both are terrible, while playing in a broken scheme that gets no one open, can't pass block anyone, and where the blockers don't even know their assignments half the time, and that ALL of this are the same things we saw with Mitch Trubisky, with Nick Foles, and with Andy Dalton, and they aren't "rookies who hold onto the ball too long" - so to chalk the rest to this seems to be willfully ignorant of that reality.
We won't be any closer to knowing what we have in Fields by the end of the season than we do now, and anyone who claims to know is a moron.
What we know right now are some really good traits, and an offense so bad that you can't tell what's on the bad scheme and what's on the rookie. Again, anyone claiming they know the difference is a meatball, mouthbreathing moron.
All we can hope for, is a new coach and GM in the offseason, and that Fields at least learned SOME things this season that will allow him to get a fast start in a competent offense under competent coaching next season.