Another quote from that article:
Felder (on Frey declining to participate in the Eagles' ill-fated attempt at a reunion album in 1990): "I think Glenn felt he should have been in control of saying when and where and how it was going to happen. I think that really upset him a lot that we were in the studio recording without him. It was only done that way because we were being told Glenn was coming in a couple of days and we were led to believe that was OK and Glenn knew what was going on. We finally got some letter or phone call saying, 'If you don't stop, you know, he's going to take legal action,' or something like that. We were like, 'Wow, OK. Let's stop. We're not going to do this without Glenn.' We did. We stopped without him."
While Felder's comment was obviously from a different circumstance, it still speaks to the fact that Glenn felt the Eagles weren't legitimate without him.... and I agree.