I would hesitate to call +Vigano a "Bishop for the Resistance", except loosely, as Father Chazal laid it out, in terms of what he believes, and the Resistance is a loose term to begin with rather than some kind of formal organization. +Vigano doesn't quite mesh with the Resistance in having publicly stated that Jorge is not the pope.
Father Chazal said that because +Vigano was "late to the fight" he's trying to be "as loud as he can". I'm not sure it's due to lateness, but rather because +Vigano realizes that he has (or, rather, had) a public platform, since he was embraced by Trad, Inc. and the convervative Novus Ordites on account of the McCarrick issue. He even had Trump re-tweet his letter one time. So he's more "famous" than any of the long-time Traditional clergy are (except for the time when +Williamson gained infamy / notoriety over his h0Ɩ0h0αx comments). +Vigano knew that he was in a position to influence the right-leaning Novus Ordites and did his best, but I think he realized that time was over when he broke with Trad, Inc. by blowing up Matt's "unite the clans" meeting. Now that he's finally come out publicly with his conviction that Jorge is no pope, I think his days of fame and notoriety in those quarters is over ... a conviction I believe he's long held, since he's never referred to Bergoglio as anything but Bergoglio for the past 3.5 years (not Pope, not Holy Father, and only once that I recall even Francis, and that was sarcastic). He'll no longer have a voice on all the Trad, Inc outlets but will be relegated to obscurity by them. That's why I think he's decided to move on and try to set up that seminary. In that regard, I think it is due to his regret over having come late to the fight, so he's trying to do what he can now to make up for it as best he can.