@SpaceFootballKing I think he does have the team's full trust, and it is proved by the number of innings he played despite the bad match he did against them before, but Furuya always was superior to him, even injured. There is no reason for the coach to change who the ace is, and even in a strategic POV, bringing a new pitcher, so a change of pace, and someone who destroyed the entire team in the summer match is probably the best idea.
But yeah, I hope Sawamura gets his time to shine, maybe with Furuya as an opponent later (in college maybe).