Well I can't remember all the details nor can I find the article where he talked about why he was resurrecting Lydia, but it sounded like he never wanted Lydia to go away. They almost canceled the farewell tour because of internal problems but they pushed on. Then after his music was stolen, I think he was about to give up on it again. But Craig (drums) pushed him to keep going, according to Leighton.
This is what I could find regarding why:
"I was pretty convinced that I was just going to do my own thing and just put it out under my own name. I was pretty set on that for a little while, but Craig was the one that convinced me to put it out under Lydia because we had come all these years with it and it would be a real shame just to let it die because of one person, which was the sole reason, if Iím being honest, that Lydia had to do a farewell tour and break up." Leighton Antelman