Really nice matchup, which I mean Yami vs Kenpachi, the other two are nonfactors and aren´t below here, Zoro and Flashy Flash get stomped hard alone by the clash between Yami and Kenpachi.
For Kenpachi:
-He has insane power and overall Dc power, this shows how great his ap is alone with Shikai:
-Insane stamina, can tank literally most attacks
-Fight off against someone who basically could use reality warping, yet he defeat Gremmy
-With his Bankai he is even far faster and stronger
-Can easily cut though steel
-Have insane reijatsu who already could damage a lot the other characters in this matchup
Some fight scene of Kenpachi in base/Shikai against Gremmy:
As you can see Lava,water and other abilites didn´t do any shit against Kenpachi raw power who destroy anything on his way, in the end he destroy a huge big meteor with his shikai and defeat later Gremmy, everything above speaks for him.
And his strongest form with Bankai is really fast and have even more raw power:
You can see how strong Kenpachi became, he kick away easily a huge giant as Gerald away and cut him in half, he was also very fast and get even more raw power.
For Yami:
-Insane speed, he should be easily on FTL
-Good Stamina/he can tank a lot, even though Kenpachi is in favour at this point
-His attacks aren´t based on dc or raw power like Kenpachi, he have a really hax ability in combination with his sword, he can basically cut though the dimensions, he cut with it everything, even against someone who can use spartial manipulation and manipulate space/time. He cut and block light based attacks, he cut though anything, he is similar as Kenpachi, he cut though anything because of his hax while Kenpachi cut everything with his raw power.
-Have mana skin who increase and make his durability even stronger
-have tons of dark magic skills, he can even created a small black hole
-has a ability who is called dark binding, it creates ropes made of darkness which wrap around the target, restricting their movements and magic(can make Kenpachi slower)
Overall here some fightscene of Yami:
As you can see Yami have a insane good fightstyle/skills in combo with his hax power who take on really strong monsters.
Duo his good hax magic he can hold his own against one of the strongest villians who can pull of spartial manipulation and gravity manipulation.
Overall his strongest attack are really deadly and lethal:
#
Final plea:
In normal states if we count Raw power Kenpachi is LEAGUES above Yami, that is for sure.
But in this battle their is just more then having just more AP/DC, Yami ability is hax and he has on his own really good speed feats to take on Yami, both have lethal attack power and can everytime win the fight very fast.
I think Yami would take the matches against Base Kenpachi,Shikai Kenpachi.
Bankai Kenpachi vs Yami could co either way, both are extrem very op and could take anytime the battle, the other two here aren´t in right place.