i muss admit that was an realy Epick fight get 11/10 points. but i still cant bring my self to watch thous all around Storys from One Piece i dont want to be rude but some how they lack the tension to atrackt me to watch it . but still when it comes to the main fights it never let us down always full of emotions and surprises !! all in one i think it its a realy good Anime !!
even if he reach the next level of his haki or even he has his awakening in this arc I doubt that Luffy was already capable of defeating a Younko by himself, because his still not on a Younko level yet, because the gap between them was so far even if Luffy's completed his new training.