I don't blame Al for still being pissed about how C50 ended in 2012. Let him jab Mike, in my opinion, since (as HeyJude states) there's no chance of any reunion at this stage (with the possible exception of revisiting TWGMTR-era studio material).
With regards to Al touring with Brian's band, isn't it possible that Al could pay the band at the same rate Brian paid them? After all, Al picked up a share of the Iconic money and could technically "float" the whole operation, even if it loses (some?) money in the process.
Yes, I suppose all of the BRI shareholders are rich enough that they could float some length of touring out of pocket, or partially out of pocket. But touring costs add up fast. I don't think Al could pay fully out of pocket for like a year-long tour.
Could he pay the band members at the same rate and just cover any shortfalls that ticket sale revenue doesn't cover, for like a 5 or 10-gig mini tour? I would assume so. Is it fair to expect that of him, or ask that of him? I have no idea.
I think Al has been breaking even or losing a bit of money on his own touring for awhile now. So I don't think he cares too much about money. But I don't know if he's interested in cutting checks for hundreds of thousands of dollars to do 6 gigs with Brian's band.
They could try to amortize the touring cost a bit by maybe doing a quickie live album or something, I dunno.