Can writers not see that these two things are not necessarily incompatible?
Phillips said the best player is going to play (and later indicated that he considers Williams the best one).
Jones said he can't envision Williams not starting, because Jones also believes Williams is the best player.
Neither is guaranteeing Williams a starting spot, but saying they see Williams as the starter. It's up to Williams to prove worthy of that trust, which I think is the real gist of what Phillips was saying.
Both have acknowledged that Williams didn't have the type of season they envisioned, but that doesn't mean to don't still have faith in him.