The ball is just not coming effortlessly out of his hand...whether it’s extension, spin rate, whatever, before it was popping past hitters and they couldn’t quite get to his fastball no matter how hard they tried.
I mea, if you take away LaRussa’s leaving him hung out to dry...his ERA is around 4.5ish, but he just doesn’t have that swagger on the mound since he’s clearly fighting himself mechanically.