re: #3 those two have really played pretty well overall if you've watched all the games (which I assume you have).
IMO -
The areas of concern right now for Marv to address ASAP are: LT, RG, DT(again), CB(assuming Clements goes), and FB.
The areas to address in the near future are MLB, DE, and maybe TE again.
I like the progress JP has made still, even with the occasional frustrating quarter or half. His accuracy and reads have improved drastically from last year. They need to stay the course with him.