Even if he could he won't be effective. We have seen guys comeback early before and it typically doesn't play out well in terms of contribution.
Also, we cannot go into the playoffs with Cam getting most minutes at PF. Yes we had a good plus/minus in the regular season but so does small ball. The further you get into the playoffs the more he will be exposed. That position was completely exposed in the finals. We will never win a title with Cam getting the bulk of the minutes at PF.
We won't win regular season games against bigger teams that are healthy with Cam getting minutes at PF, either...unless our guards and wings shoot lights out from outside.