Seems to me this is pretty straightforward ... when the comments were made, and within that context, the head coach said that the quarterback who ended the previous season as starter would head into the next season as the presumed starter. I suppose one can infer what ones wants out of "into next season," but the argument can clearly made that it leaves open the possibility it meant heading into training camp. I'm having a hard time grasping why that is such a flashpoint for some.
Context may change. There could be a new quarterback added to the mix. Or the guy who heads into the season as the presumed starter will soon show he as not progressed to the satisfaction of the team, and a change might be in the offing. Or ... the presumed starter heading into camp shows clear signs of progress, to the extent that doing anything other than seeing how that arc plays out would not be in the interests of the team.
Absent knowledge of what will transpire between now and then---or between the time the head coach made the statements in question and the start of training camp---I'm not sure why we are spending so much time psychoanalyzing the head coach from afar for making what look to me like perfectly reasonable comments given the context at the time.