I just say GS is a kind of random thing and it's a OK to face trouble with one or two players.
As if there was a great free throw shooter who's able to make 10 of 10 FTs on a good day, but more likely he will have 9/10. And that one missed shot wasn't a bad luck actually, it's just how probability works.
So having poor GS on my key player is annoying, like missing a clutch free throw does, but it just happens, it may be categorized as Life Engine.