no... didn't mean GS would make things worse. just saying that sometimes i've gotten extremely disappointing results. but all those times were with normal minutes mostly (once or twice had someone over 80, but that's it).
92 minutes -- If you have a must-win game I'd actually train GS if that's an important player. Especially if a bunch of other players had too many minutes. Still expect a drop, but... things won't be as bad as if you didn't.
But if you can win easily without that guy in top shape, & the rest of your players are fine, then I'd probably skip the GS training.