tpdc, sorry, but your quote below is simply not correct.
"According to Hal Prince, Mostel was never approached about renewing his FIDDLER contract"
What is the source from which you reaped this piece of information? I have never, ever heard anything like that before, from either those who knew and worked with Zero Mostel or those of us who know and have worked and/or indeed do work with Hal Prince.
Mr. Prince is very much alive and active and accessible. According to the assistant that Mr. Prince has now had for 38 years, the above quote attributed to him is "utterly preposterous."
A producer would want to remove a star from a show who is bringing every performance to over one hundred percent capacity because the producer fears keeping the star who is keeping the show at over one hundred percent capacity, will turn the show into a "star vehicle?" The thought itself is clearly ludicrous.
In fact, Mr. Prince was the "lead negotiator" in trying to get Mr. Mostel to renew his contract, yet again. Alas, they were unable to find a way to work around Mostel's looming lucrative film salaries. But they did come to a gentleman's agreement about Mr. Mostel starring in future stage productions of FIDDLER. In the mid 1970s when Mostel did his legendary revival tour of FIDDLER and its return to Broadway at the Wintergarden Theater, Zero Mostel was then paid an extraordinary $50,000 weekly salary! This was amazing for that time (it would be quite amazing now too) and was "all over the news."
"Blow out the candles Robert and make a wish. Want something, want SOMETHING."