And vocalists like Lennon, Dylan, Jagger, Brown, Charles and Morrison, where would they be placed?
Ray's got some influence and versatility and some impact, but technically he was not great. Lennon doesn't score in anything. Brown and Dylan have some influence, a little versatility too, as Bob would change his style for different albums, and James had distinctively different approaches for ballads, gospel-soul and funk, but both do absolutely awful in the other areas. Morrison has some impact and influence, but was below average in the others.
There are SO many more deserving names that I doubt any of them would crack the Top 100, other than Ray. Morrison maybe in the 90's or so, but that's just a rough guess. You need to remember there are lots of rock styles over the years where the emphasis is mainly on vocals, that's the primary focus of the records, so most of the acclaim comes from that area and the skill level to be successful in those fields is much higher. These guys you brought up were doing records where the writing, lyrics, avant garde production, etc, were the focale points, not the vocals, so to be saying that they're deserving of making the list just because of their overall name recognition is the absolute worst way to approach this. Those names make the lists where the topic is centered on their greatest strengths, not their weaker points, as is the case here.
Seriously, Echoes, would any of them come close in the criteria to Teddy Pendergrass, James Taylor, Lauryn Hill, Aaron Neville, Cass Elliott, Johnny Moore, Mavis Staples, Dion, Christina Aguilera, Little Willie John, Alicia Keys, Wilson Pickett, Brian and Carl Wilson, and literally hundreds more? Of course not, so why even bring them up, especially at this point?