As far as Brooksville goes(Sanborn), amongst thuc trad lines, Gerhard de laurier's line(sanborn) is considered the more dubious of the lines.
This is a flat out lie, and, while I have a great deal of respect for Father Jenkins, SSPV have been just plain lying about the +Thuc lines for decades now.
As for the Mendez/Kelly situation, the photos prove absolutely nothing. What's at issue is that Mendez had suffered a stroke shortly before the Kelly consecration, and his family testify that he was extremely confused afterwards and that he didn't recognize them. If there's a question about anyone's "mental state," it is NOT about that of +Thuc, but about +Mendez ... but SSPV have been lying about the "mental state of" +Thuc forever now. It's disgraceful, and constitutes calumny against +Thuc and also the bishops, priests, and faithful who are associated with those lines.
Archbishop Thuc had advanced degress from Rome and taught at a seminary. He was fluent in many languages. There are many people who have testified (a couple whom I know personally for for whose veracity I can vouch), that Archbishop Thuc never showed the least signs of dementia (unlike +Mendez). When +Thuc was staying with Bishop Vezelis, after the +Carmona/+Zamora and +des Lauriers consecrations, he would be sitting at table and switching back and forth between languages and not skipping a beat, keeping track of multiple separate conversations at the same time. He was very adept at Latin and offered Mass with great reverence and following the rubrics with great precision. His autobiography, also written after these consecrations, demonstrates an extremely lucid mind (in addition to great piety and reverence), as he was recalling from memory the names of obscure people from his past (a cook and the names of his family members, and many others, drivers, etc.). He had a much better memory than I do. While it's clear that he made mistakes in terms of a couple that he consecrated, he denies ever having consecrated the worst offenders. There are man people who have no issues lying about having received consecration from +Thuc. But poor judgment or imprudence says nothing about whether he had the mental capacity to validly consecrate. He simply needed to know what the Church intended by a consecration, have intended to do it, and to perform the Rite. There is absolutely zero evidence that his capacity of doing so can be called into any doubt whatsoever. Bishop Kelly completely fabricated the notion that two competent witnesses are required to verify the validity of episcopal consecration. Father Cekada completely shredded his dishonesty, where Bishop Kelly sometimes removed parts of quotations with ellipses that undercut his point. One of The Nine testified later (I heard it from his mouth) that after Father Cekada had presented his information regarding their validity to the group, that then-Father Kelly responded along the lines of, "We can't say they're valid, because people might go to them." Bishops were regularly consecrated clandestinely behind the Iron Curtain, with the authorization of Pius XII, and their consecrations were held to be undisputedly valid by the Church.