Again, I can tell you did not read his article "Two Bishops in Every Garage".
There is nothing in that thesis which gives evidence that +Thuc was insane. The conclusion of the thesis is -- avoid +Thuc because he's trying to setup a parallel church authority structure and he hangs out with schismatics.
What's ironic is that Fr Cekada wrote that piece in 1982, published it in Jan 1983. One of his main points of contention with +Thuc was that +Thuc believed that Pope Pius XII was the last true pope and that sedeprivationism was a joke.
Then later that year, in 1983, Fr Cekada left the sspx and became a Sede.

Fr Cekada never said +Thuc was insane, he just disagreed with him (at first) on Sedevacantism, which he later agreed with.
Another "nothing burger" article.