After Steve Kazee left ONCE, the Guy's costume changed to a darker Henley and that red plaid shirt.
And most of the CHICAGO stunt casts that I know about catered to their stars. Wendy Williams, for instance, gave Mama Morton a "how you doin'?"
Words don't deserve that kind of malarkey. They're innocent, neutral, precise, standing for this, describing that, meaning the other, so if you look after them you can build bridges across incomprehension and chaos. But when they get their corners knocked off, they're no good anymore…I don't think writers are sacred, but words are. They deserve respect. If you get the right ones in the right order, you can nudge the world a little.