@cin Museo tensei has obviously weakness,like I said beings who know the move can cancel out the affects, or if you have someone kind of move that affects nothingness, but doffy has nothing on him that can affect Kens MT, You can't say Haki can affect MT because of verse equalization because Logia intangibilty is different from his intangibilty.
A perfect example would be shadow cat, she has the power to go intangible, or Marian man hunter who can go intangible as well, logia intangibilty is really in a way pseudo intangibilty, because they don't phase through things,they just become the elements their devil fruit is, like luffy was able to hurt crocodile becasue he covered his body in water to harden his sand, if you have the opposite element to fight with the type of logia, even poeple without Haki could hurt logia types.
That's why in verse equalization doffys Haki won't work with Kens MT,Kens intangibilty is not an element but a force, nothingness, even raohs gosho ha, which literally a ball of energy or aura, much like how Haki is the energy that flows through beings like aura, could not hurt Ken at all, he went through and proceeded to severely hurt Raoh.
And now that you point it out, all standard battles do have verse equalization, so that means Ken can use Haki form watching doffy use it, it's not something special only to doffy, and it's basically a technique sooooo via sueichein, Kenshiro can use harden Haki to penetrate through doffys skin once and get his pressure points.
However I'm going to give you the benefit of the doubt and imagine that ken can't use Hokuto Shinken on doffy because of superior Durabilty, he still has gento ko Ken and Mt, and those are just pure anti dura hax, vaporizing on the cellular level, or atomic. Also Ken has something to help control the battle as well.
Like doffy, with Hokuto Ryü Ken Ken can turn the battlefield into his favor, by creating a field of distorted space, creating a anti gravity effect lifting doffy off the ground and binding him. Not to mention, doffy can't see anything while within this field because it siphons all light, and removes one sense and feeling of where they are, Did I forget to mention Ken can drain people's stamina, yep thanks too Hokuto Ryü Ken, Ken can now drain the ki and stamina of people throughout the battle and they wouldn't even ot i.e. it until they feel weaker, so while Ken dodges, doffy will get weaker and slower.
See Kenshiro has his own away of winning this battle, however if people decide this is inconclusive, I suppose we can close it as that.