^^
Spelling errors, childish expression of opinion in response to an objectively stated assertion (and a response that has nothing to do with the original anyway - "association" in the public eye generally has nothing to do with talent or whether anyone "sucks"), and an outlandish statement looking to drag a conversation in a different direction than it was intended.
If you're ever wondering why you get accused of being a troll, there's a glimpse.
As to the OP, yes Jane Lynch will be performing. As for other notable instances of a replacement, I remember that Brent Spiner had already left 1776 before their performance in the '90s, but in general it's not very common because lately it's been rare for a show to open in the beginning of a season and run long enough for an original contract to expire before the Tony performances if its nominated. Recent years most musicals at the Tonys have been spring shows, not unlike producers gaming the oscars with end-of-the-year releases for their hopefuls.
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.