Review Detail of Killua_Zoldyck_6087 in King Of Chaos

I just started reading King of Chaos, hope anyone or author answer my question. Since Ye Xiao went from low to top of Heavns and then got reborn in Land of Chaos, did our MC lost some of his common sense. During the time of exploration of Lost Forest of Red Moon, those girls of Primordial Mystic Race was being so selfish and MC was agreeing to them all the way down, is this how an old monster who climbed to the peak should be? No scheme, Not thinking about himself just acting like a fool? Hope anyone clarify me!!!