According to Schmidt, the 1975 season turned around in the second half for both Mike and the Phillies, because of one reason: Dick Allen.
From Schmidt's book Clearing the Bases:
At that time we badly needed a hitter in the five hole who would command enough respect to force the other team to pitch to Greg Luzinski. Dick became that man -- and more. I had another mentor, someone who decided to put on that Phillies uniform for one reason: to help us understand what it took to win. We responded. I can alive under Dick's and (Dave Cash) A.C.'s watch in the second half of 1975 to finish with 38 home runs and again lead the league. We finished second, one step closer to the top.