Please, stop talking about Radagast as a squirrel. It reminds me all too much of the Disney movie
The Sword in the Stone where Merlin transforms himself into a squirrel and gets harrassed by a rather insistent female squirrel...
Anyway, this thread did make me think. I can't answer the initial question, nor anything stemmed from it this far, but rather, I'm going to present another point the thread title reminds me of... Gandalf really is a superhero. He doesn't always defeat his foes easily or even win, but he seems to be rathe good in everything. Is there really anything he's bad at? Of course he's a maia and therefore very powerful, but he seems to be a jack-of-all-trades unlike the other maiar we meet, who are most often specialised in something and less good at other things.