And for the top twenty european birders i do believe there can be such a thing.
It is impossible to put together such a list - do we decide it by who best knows their local birds, who best knows all the scarce migrants in their country, who can identify the most species worldwide, who has published the most, etc, etc, etc. There are many persons who could be considered top in their own area, but just because good in one area, perhaps a better publicised area, eg rarity identification, does not make you better than the dedicated research worker or whatever.
Earier, you marvelled at that Finnish guy plucking out a RF Bluetail singing on a far hillside, that to me is nothing more than someone knowing his local birds (and being in Finland, a relatively small total of species to know anyhow). Who knows, take him out of his limited sphere of knowledge and he might flounder, or maybe not. And, out of interest, how could you decide to ran him above the likes of Steve Howell who is just about the most respected birder in Central America (a region with countless more species than northern Europe), or for the many others you didn't bother to mention, ie. British-born birders who have established themselves as recognised leaders in other birding hotspots around the world, including Southern Africa, etc.
For every good birder in one sphere, there is another in another, they are not comparable.
As for using technology or not, twitching or not, whether it all makes you lazy or better, or whatever, who cares? It is a hobby, if you feel it improves you or you enjoy it, that's the end of the discussion, do it.