1) Any arm that is "good enough" in the NFL is a great arm. Notice I didn't say the greatest arm. Quit trying to re-define terminology just to suit your argument.
2) You failed to recognize that "football dumb" typically means un-educated. Intellect is basically the ability to learn. Everything I've read about Rosen says he is very intelligent, so he should be able to learn "football" terminology; after all, you did!
3) Without inside information on Rosen's training it is hard to know, but it seems as likely that the coaches we let go who were directly responsible for Rosen's training were not satisfactory to Flores, while the new coaches have been noted for their teaching ability. This position makes a lot of sense, if its true. We'll know more after training camp.
To sum it up, your objections to my first two questions actually support my reasoning, you just used too many words you don't understand.
My third reason concurs with your comments on speculation, so what was the point. I have expanded on my reasoning for that speculation and I hope that helps, but in the end, speculation is speculation. Usually adding clarification to speculation ends up being no more useful then polishing a turd.
Spk Engrish!