DR TCB, Roz was a great comedienne and I think she's wonderful in both recordings of WONDERFUL TOWN, but GYPSY calls for better vocal chops than Roz possessed, IMHO. I believe Lisa Kirk did the ghosting for her.
I thought Tyne Daly was amazing to watch in the theatre, but I find her hard to listen to on that cast recording. By the end of her career, with her wide vibrato and mannerisms, Merman was kind of camp, but she was in her prime one helluva great singer: Irving Berlin, Cole Porter, Jule Styne, and Gershwin wrote for her, (for her! for her!)and that's not chopped liver. End of soapbox.