a big gap is good , but what happens is when the anime starts showing canon episodes the gap gets smaller and smaller and then it eventually catches up with the manga, but thats not good, but at this point , the whole manga is on its last arc and its coming to an end , so kishi shouldnt do anything about the anime(although he cant anyway) , so the anime companies should stop the filler arcs all together and stick to the canon plot because eventually the manga will end and their will be no more benefits of fillers when that happens.