Johnny Sauer was very good, best color man we had. Osborne's first stint was good also, however second time he had lost something which is surprising since he isn't that old.
But yeah, Hillgrove was never a play by play man. He is an anchorman and he never got any better at play by play, especially for radio.which is a lot more difficult than TV. He needs to go, especially with him & Groat on basketball.
Unfortunately the replacement may be Larry Richert who may be as bad if not worse than Hillgrove.
I saw a few games on youtube and kind of under-rated was the job Myron Cope did filling in for Johnny Sauer that year. Myron had a lot of schtick but was a pretty knowledgeable guy.