No offense, but stat watching is a terrible way to scout players.
Nevertheless, I agree with your conclusion. He has a great arm and prototypical size, but he has sloppy footwork and has never "put it all together" on the field. He has starter potential, but he is a couple years away.
Furthermore, depending on the underclassmen that declare, he could be ranked as low as 12 (by my rankings) or 10 (NFLDRAFTSCOUT). Granted, these rankings are fluid, and will change by the time the draft rolls around, but even if you bump him up 2-4 spots, it still has him ranked between 6-8. Last year, 5 QBs were drafted in the 2nd- Luck, RG3, Tannehill, Weedon, Osweiler. Another two (Wilson, Foles) were drafted in the 3rd.