Do remember that Nathan Lane/Matthew Broderick co-hosted in the year of The Producers, though I do understand the reluctance to have a potential nominee as host.
NPH would have zero time to rehearse a Tony hosting gig. "Hedwig" is essentially a one-man show, and he has no understudy.
Eh. In a pinch.
True, though once the show is up and running, he will (generally) have days free.
I know a guy whose ex-wife tries to have sex with him every time she sees Hugh Jackman on TV. I shall warn him.
I was in the audience of the Tonys that year (#humblebrag) and I remember during the commercial breaks they were talking about how they ad-libbed basically the whole show.