Maybe the mang writer made a good decision quitting while he was ahead, but I kind of want to see Kenichi's journey into master hood.
Say, he starts off inferior to the specialists, but he learns how to beat them with the art they're weakest to. He starts off one vs one, and eventually takes on all six at once, learning to make snap decisions and flow in and out of the correct forms.
Or something. Maybe see how he finally got the old man's permission to mary Miu. Learn some more about him and the "Big Breasted Monster".
Also, Hermit and Berserker were dropped plot threads, as was the kid.