He seemed to me to be the most keen for the Eagles to get back together. Don initially said it wouldn't happen; Joe initially said maybe they could get together as an "Eagles Friends and Family" but not tour under the Eagles moniker. In other words, both initially were reticent to go back to "business as usual" without Glenn.
All except Timothy.
Timothy wanted to go back to full-on touring as the Eagles as soon as the possibility was hinted at. I don't think he's ever been the least bit hesitant because he doesn't want anything to get in the way of it happening.
I don't think it's anything personal. I think it's simply because unlike Joe and Don, he can't make nearly as much money touring solo. He needs Eagles cash more than they do.