Nop, NEKO and INU are arguably YC2 in SULONG, BASE NEKO and INU were stopping JACK individually, without using the SULONG which was confirmed to have no full moon at the time that JACK invaded, Base INU was = ASHURAm BASE INU = YC3, ASHURA if came out better against JACK and hinted that there was no way he could lose against a YC3 (jack), so INU SULONG, NEKO SULONG AND ASHURA SÃO YC2.
DENJIROU apparently is the strongest sheath, he was colliding like ZORO (an angry zoro), ASHURA hinted that he would be a big problem, YC2 too, Kinemon, Kiku, and Izou and Kawamatsu, together, with certainty can reach YC2 . The sheaths are strong.
right now, even though he is injured and without SULONG, NEKO is going to PERO, who is an almost YC3 veteran.