Wrong - he was sour grapes. He wanted to be the Chief Rabbi of Israel and it did not work out for hiim - he knew he would never be named. I know more about this than you do.
You know absolutely nothing about it at all.
If you did you'd have a single hint of a shadow of a shred of a vestige of a trace of evidence.
But you don't.
Fact: Israel Zolli was received into the Catholic Church in February 1945.
Fact: Yitzhak Herzog had been the Chief Rabbi of Israeli Ashkenazim for nine years at that point.
Fact: Herzog was only 57 at the time and in good health.
Fact: Herzog served as Chief Rabbi for 14 more years after 1945.
Yet we are to believe that Zolli was being considered for the post? What was supposed to happen? That Herzog, who had served with distinction - and who had politically useful close ties to the British Empire (he had served as Chief Rabbi of Ireland previously) and who was also one of the leading lights of religious Zionism - was going to be forced out of his seat? By whom, exactly? On what possible grounds, given his exemplary record and his invaluable insight into the establishment of the new state?
You are digging yourself deeper with this nonsensical assertion.