1. Fr. Zigrang
2. 1962 Tridentine Missal
3. Fr. Zigrang was originally ordained with new rite, but I'm not sure if he was conditionally ordained or not (probably was). I haven't asked him, but I know that other priests in his position were conditionally ordained -- just to be safe.
4. I haven't asked him.
5. No, the SSPX is a priestly fraternity. There aren't any lay members.
6. Again, I haven't taken a poll, but I believe that such consecrations are valid, though illicit. It makes quite a mess when you have hot-head priests and bishops owing allegiance to no one but themselves. At least in the SSPX there is a structure, and priests give obedience to SOMEONE.
After all, the priest is -- by nature -- a "helper" to his bishop. That's one of the reasons I support the SSPX. It allows traditional priests to stay traditional, without many of the risks of being a "loner" or "maverick".
That said, certain bishops consecrating other bishops for the "good of the Church" can't be condemned too much -- after all, the SSPX was founded by Archbishop Lefebvre, who for the good of the Church consecrated 4 bishops to succeed him.
(Still, you notice that AFTER 19 YEARS we still only have 4 bishops -- they haven't multiplied like mushrooms -- that's very important)
SSPX priests are in the best position right now, because they neither have to compromise (Novus Ordo, Indult) nor do they have the risks of being "alone" and disconnecting from the rest of the Church entirely (Sede, Independent). The latter tend to think that the True Church is down to a remnant of a few dozen -- a bit of a distortion.
I think the SSPX is taking the safest, and best, path in this Crisis.
In Christ,
Matthew