...at his disposal, making him a super-trusted-user, so to speak. That, of course, is perfectly OK. This is Kos's blog, and, if he wants, he can give infinite troll-rating capabilities to whomsoever he pleases.
However, I do think it would be a good idea if a) the existence of super-trusted-user status were clearly stated (for example, on dKospedia) and b) if the recipients of such status refrained from using their troll-ratings against people who disagree with them (and instead used them against actual trolls).