you mean shintenshin, the family that ino's in..? if that is what you meant I still don't know who is the strongest. There isn't enough information on that clan yet.
no...shinteshonin...the guys that kidnapped one of gaara's students just to fight him...this happened right before naruto left to train with jiraya for three years
Yeah really, after Valley of the End, it goes to hell and the fillers are mostly funny but not really necessary to watch until Shippuden.(unless of course you're a die hard fan like myself.)
o.0 dont remember any of the filler episodes , except hinats jutsu wish they implemented tat in the manga.So i really couldnt telyou who the strongest is.