I'd agree with that, although if I was being pedantic, I'd say that Fats Domino just inches in there as the most important rock and roll player. I know his genre was slightly different, but if you're going to argue something like "The Fat Man" was the first rock and roll record, like a lot of people do, then I'd have him as the most influential player as far as rock and roll is concerned.
If you don't buy in to that, then I guess Jerry Lee was the best technically, if only he would have cut back a little on the glissandos for my taste.
Little Richard in my opinion was the best singer full stop from both the rock and roll and the pop genres from the fifties to the current day, and that includes people like Freddie Mercury. There is a clip somewhere on YouTube that I've seen that shows him doing something very rare for him - singing softly. And it is quite arresting. He wasn't a one trick pony, as often stated.
His piano playing was good, but sometimes a bit sloppy. But in a funny way, I prefer it to Jerry Lee - it's more fun and musical. Jerry Lee can come off a bit mechanical sometimes to me, although I think technically, apart from Fats Domino, he was the best from the genre.
Just my personal opinions there.
Anyway, 87 - not bad. I guess we can't complain, but it's still very sad.