Let me know if this makes sense: Can we really count Tom Bombadill if we dont know who/what he is? Obviously, sine the whole [ring cant control him, but he cant control ring] thing adds some debate, and for all we know, (this is a reference to Battle for Middle-Earth 2) he could have a "Sonic Singing" power that would blow a humanoid Sauron away. Like RL, you cant really define a power of something unless you know enough about what it has done, and what it pre-hinted.
Also, about spiders-hobbits:Bilbo was as we know an excdptional hobbit. Think of what might have happened if you gave the Ring and Sting (dont forget an empty stomach!) to each hobbit and give them a spider of Mirkwood, a la gladiator style. Tooks might be able to beat some, but not all.
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