https://www.youtube.com/watch?v=TeHQvMC0OwI1) Halford left under different circumstances; entire band was tense with music changing around 1990, trial where they had to defent metal and Rob's stage accident where he had a show with a broken nose and none even cared (Hell Patrol was played instrumental as he was there in the stage fog with blood coming out his broken nose). They were all not 100% there and didn't get in terrible terms when Rob left to explore some other genres since none was sure where to go next. And if Travis didn't go after Halford in Fight, he'd never return with Ripper to reboot JP.
2) KK left on BAD terms, he shat all over JP; that they aren't trying hard enough, that music has changed too much (he took Nostradamus very personal), was so sure JP are done and he'll invest into golf courses; then tables have turned with his business; suddenly blamed Glenn for many things and of course it'll be hard to accept someone back after that. Which is a shame because Tipton and Downing were the best guitar duo ever and with Tipton's health, it'll never happen again. And yes, JP misses that A LOT (with all respect to Firepower that I love, Angel of Retribution was the last proper, raw JP album even though they played it safe there)
3) As someone said, with all respects, Halford is Halford. We'll never get that class again in our lifetime. When JP was without him, they had smaller venus, Halford solo band filled stadiums, easily
With all that being said, I'd like to see KK next to Faulkner, that would really do it some justice. On Les, He's one of the best drummers ever, but "machine" Travis is just a better fit for most songs. It would be great to have 2 drummers depending on songs.
So I'd actually be greatful if we could have both bands past this pandemic, to see them life and get some new albums of course. Two unique flavours of what was once THE HEAVY METAL band.