Wow im surprised no one mentioned the fact that he said prot doesnt need a druid but necro sometimes does... aside from hrung, necro is the easiest of those bosses to tank. I have not heard of a tank soloing prot yet, much less multiple tanks that can solo prot. Are you sure this is this correct? I'm not talking tank- walking either, im talking full on head on tanking no heals prot, dont see it possible yet with current gear and if it was done, would cost a lot of plat and gold or something thats not practical as having a dozen bashers etc. but if we go there...prot doesn't even need a tank, much less a druid as it can be easily walked.
Have tanks on Mabon who can solo Prot, had a Mage tank prot in the past over here, I know we had 1 tank do Gele with 1 druid and i think Bt with 2 druids but i dont think hes tried soloing gele yet, hes currently on a break due to content being to easy to deal with