For anyone that actually cares what happened here, I'll inform them since I've been a good friend of the bands for the past few years.
Anthony, Chris, Kaity and Joel all quit Long Shot Hero because Shaun and Brian were taking the band way over the edge with business. Anyone close to the band knows this. Contracts became a daily reference, Shaun ruled the band like a dictator and whenever was questioned would threaten other band members saying that him and Brian "owned" the band. (Brian owned the van and trailer, and Shaun held most ties to promoters and most management and name right that he stole from the band after being in the band only 9 months by making them sign contracts).
Chris quit because he didn't want to deal with Shaun...Joel, Anthony and Kaity quit shortly after a show where Shaun threatened a promoter with a knife when the band didn't get paid it's guarantee. The four of them had basically been forced to throw away the last FOUR YEARS of hard work they did promoting the band and writing music. I have been alongside for about 2 years, and will say that this band, despite whatever anyone has to say about them, did work their asses off. After all, they were a ska band, and ska bands arent usually the first to get any respect.
So after the band broke up, Brian and Shaun still owned the copyrights to the name. Anthony, Kaity, Chris and Joel said "Fuck it, we got invited to Warped and worked our asses off for 4 years, we deserve it - we're going to invite back Kate (who Shaun had made the band kick out) and play this last show".
No sooner did it become public that the remainder of the band was going to play Warped than Shaun called Warped Tour and threatened to sue them if they allowed the remaining members to use the LSH name on Warped. Warped said they then wanted nothing to do with the whole clusterfuck situation, and within minutes had replaced LSH from the Ernie Ball Stage. Many LSH fans that bought absurd $30 tickets to see their last show got dicked out of the last show that THEY and the remainder of this band deserved.
Most of the old heads like Joel and CHris are working on new projects. Brian and Shaun I think are starting some gay emo band called Cutthroat Academy.
Basically the 5 originals needed Shaun and Brians permission to play and use the LSH name, but they wouldn't call Warped and give it to them.