Never thought much of Miles (or Lindquist), but Stringfellow is a beast. If Miles is out, wouldn't be surprised if Williams earns the starting gig... fully realizing all the hype around Troy could be unfounded.
I believe under the circumstances of not having a returning QB with a ton of experience, CP will compete the position at least through Spring practices and possibly the start of Fall. Miles seems to have a bit of a hitch or irregularity in his throwing motion and that will likely open the door for Linquist or Williams if it isn't open already. Running or scrambling ability, which both Linquist and Williams reportedly have as does Miles of course, will be important, but not as important as a strong and accurate throwing arm. Probably just as important if even more so will be intelligence and leadership on the field. CP's best protege at BSU, Kellen Moore, was not a scrambler nor did he have a strong arm, but he was very accurate and football smart.