I do not understand why you would pick a 'raw' quarterback #8 overall, knowing that he needs real development, and then bring in a young guy with no track record of coaching QBs to try to work with him.
This to me is so crucial. Ultimately it will be down to RT on delivering on his development, however, I do believe he would be further along with a more experienced coach.
I've said it on other threads, the biggest things I see right now are
1. needs to seriously work on his footwork, it's just not good enough at this level
2. needs to be more aware of defences and his route progressions - know where to go with the ball and... 'quicker' - development of his footwork will help with this.
3. and this is one I haven't mentioned before, but I would like to see him get more rotation in his throwing motion, at times he can appear to push the ball rather than really deliver it.
4. I'd like to see a greater sense of urgency not only in taking off and running but also in passing [see point 2], sometimes he's too static and slow - he made some good and timely choices to take off and run yesterday
I think we've been spoilt with the likes of Luck etc. in recent years and how quickly they have developed. With how RT is going now, is probably more reminiscent of typical QB development from years ago.
He's doing a decent to good job with what he has to work with certain key stats being up slightly over last year like TD's and Completion % but I would have liked to have seen a greater reduction in interceptions - this is where strong coaching can help, with either fundamentals/reading defences/knowing where to go with the ball, but also helping with game planning and play calling and putting him in good spots.
With a better OL I would expect a whole lot more from him - can he deliver? that's the ultimate question.