I guess I was looking at this as more of an inclusive rather than exclusive list. “Greatest” seems a bit vague, kind of Rollingstone(ish). For me, the Edge adds an involvement, energy, and emotion to U2's palette that would be otherwise missed (Bullet the Blue Sky or Van Dieman's Land). He’s on my list and one of my fav’s. If you don't feel he stacks up with some of the others you mentioned, as a technical virtuoso enough, maybe we aught to reevaluate adding say... Muddy Waters, Son House, Lead Belly or any of the other blues folks who's simple but heart felt playing influenced Rock music indelibly and your beloved Steve Howe, etc... Is the next requirement of this pantheon to be, playing “fast”? So lets say for argument sake we replace J.J. Cale (the true, slow hand) with say, Steve Vai??? Please!
Happy (technical) Listening!?