ok I thought of a method that could be done to defeat Naraku but it envolves team work...
plan A: have both Kikyo and Kagome lauch there purifcation arrows
at Naraku's front to draw his attention while that occurs have
Inyuasha and Koga strike from at his rear at 45' angles to force him to focus on the continued hammering blows his guard then should be wavering a bit from trying to keep the attacks at bay..Then have Songo use her Haraikos (boomerang thing) like a shield for Moroku after it's thrown have Moroku skydive off of Kirara above and at a close proximety to Naraku so his stupid shield won't mean squat and have Maroku use his wind tunnel while having everyone hammering on him from all sides he can't stop it all he'd be screwed if he tried to lash out.and if the attacks don't get him death from above sure as hell will.
plan B have Inuyasha use his Adament barage backed up with the wind scar with Koga backing him with his lightning ability then have Kagome and Kikyo attack from his back while he's focused more on the defensive in the front have everyone focus one point at his back then have Koga throw Inuyasha at Naraku while using the Adament Baragae wind scar como at point blank range. If u think that either of these plans may work or have any ideas post it.