I understand where you're coming from, but in the end...these are musicians, this is their music, they came together after years apart and rekindled a flame and love for their own music. Whatever shape or form they want to express themselves in is alright with me. I would love for Plant to be a part of it(actually, it would be my preference), but if not, so be it. There are countless musicians and singers that would be honored to sing for them.