I really cannot see the parallels between Feeny and the 4 cardinals. It should be noted that over 2 months prior the dubia were sent in PRIVATE to the pope. Imagine that, 4 cardinals in good standing write a private letter, and the only thing they get is silence.

This is crucial to understanding why they publicly published their questions. The Pope could have answered, either confirming, denying or even telling them to be quite, but instead he chose silence.