If you take into account the balancing : Removing Kaiten and potency change.

Removing Kaiten will allow you to use more Shinten. If we base our math on Shinten, this mean Kaiten (20 Kenki) = 216 Potency. But of course, boosting Midare by 50% with Kaiten mean a 330 potency boost.

So they remove Kaiten, added an auto crit and nerfed Midare quite hard : 990 with Kaiten -> 640 auto crit (6.11). 350 Potency loss (crit DMG compensate that a little if you meld full crit tho)

Ogi Namikiri got a strong nerf too. From a total of 2700 Potency (With Kaiten) to a mere 1600 + Crit. We barely compensate the Potency loss with the crit. But that's not even true, the truth is : It compensate the Potency it had earlier but like it has not crit nor DH.

My math are surely wrong in a general mean, I don't take other parameter into account.

I hope for samourai that they will rework it for 6.2 into something more interesting than before. Even more than a Kaiten-based Samourai, At least I hope so