Accusing a person of lying is very serious. It is not something to do based on a feeling or intuition.
Where do you think those feelings and intutions come from? They come from assessing viable evidence, Jayne.
Suspicion is only a sin when it doesn't have sufficient basis. That leaves a lot of grey area. It is true that we should be slow to judgment, but that doesn't mean to be clueless ninnies. If you saw a man dancing in a tutu with a standee of Judy Garland while singing "Cabaret," would you say "Well, I'm giving him the benefit of the doubt, maybe he's not gαy but only confused"? If you saw someone stumbling down the street stinking of alcohol would you say "Hm, maybe he's not drunk, maybe he just isn't very good at pumping gas and got it all over himself"? We don't know the heart, who knows!
Some Catholics have gotten to the point where they think they need to have photographic evidence, or ESP, to be able to suspect anyone of anything. It reminds me of what a lawyer said the other day, that many people today dismiss circuмstancial evidence but that in reality it is very important. When trying to figure out if someone was guilty of a crime, in the past, you'd try to establish motive. Now it doesn't matter; if there's no video of the person doing the crime, no DNA sample, then there is reasonable doubt about their guilt. We live in a world that has become totally devoid of common sense.
Many heresies are exaggerations of one aspect of the truth, and the SSPX philosophy that you are showing, Jayne, is kind of like that -- it's an exaggeration of the principle of being slow to judgment.
However, that being said, I agree with you in this case and would say there isn't enough evidence to suspect Nonno of being Father Cekada. I make no pronouncements about Nonno, except to say that something felt off about him. Right away he began criticizing the idea that it was a miracle that permitted Father Ramolla to stay in the U.S. It's kind of a strange thing to concern yourself with unless you're involved in some way. It's a sure thing he is someone on the pro-Cekada side of the fence, that's all I'll say, but he strikes me as being much more subtle than Father Cekada.