I never met Tammy Grimes, though I wore out my LP of THE UNSINKABLE MOLLY BROWN listening to it.
When I was representing Howard Keel back in the late 1960s-through most of the 1970s, he did a production (possibly a short tour) of MOLLY BROWN with Ms. Grimes somewhere, I believe, in the Midwest.
What surprised me a bit was that, by contract, he got top billing.
Yes, he was certainly the bigger name, but it was her show.