Congratulations, you have found the 2 secrets of this game regarding Debuffs

those two took researchers of this game, like me, a lot of time to figure out, and usually via hard ways (through dead fights)

for me, the term ''causing'' and ''receiving'' are the same (since im bad at englisk), though the mechanics are different

i'll explain such mechanics briefly below, so it's easier to understand

let's use Neji, Water Main, Kurenai Summer and Chojuro with water main as tests subjects

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About Neji, he causes Acupuncture with his mystery/chase. When causing the Debuff, the system will compare Neji and the affected unit's control rate, and then using a formula to check the percentage, and then (cough) randomly decides if the control is failed or hit. ofc in this case, 100% = not fail. that explains the fails and also the reason why sometimes even ~91% control rate still fails.

As for Water main passive 1-2, she causes Chaos whenever she causes a critical hit, so the chaos is programed to happen at the same time the crit happened without any intervention of control rate, that's why whenever she crits, she causes chaos. Although there is still a chance through it, and that chance is the critical rate of hers and of the affected unit's to find out if she causes crit or not (this is rip if she uses chase 3)

Regarding Kurenai Summer (and other ninjas like Sasuke Rinnegan, or Fu's puppet), their passives are programed like Yes and No question, there's a 45% chance to answer Yes. If the system is answered Yes, then the affected unit will suffer from Chaos.

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Now for Poison Tai.

Poison Tai not only works whenever you deal Tai damage, it only works whenever you deal damage. So if for example, Guy kicks Madara, he won't get damage and won't get Poison. However, there's more of the programming into Poison Tai.

If that unit is already causing damage in that round, then deals damage to a unit that is immune to damage, the system will check it as dealing 0 damage, not not dealing damage, therefore it will still counts as did deal damage, therefore the affected unit will get poison.

2 brief examples:

Eg1: chojuro hits 3 puppets (all non water element). he didnt deal damage at all --> no poison tai (easy understanding)

Eg 2: chojuro hits 3 units on row 1, kills them all, and then move on to row 2 with 3 puppets (all non water element). Here, the system counts Chojuro as deals 0 damage to the puppets, not didnt deal damage at all, because he had killed 3 units before. so the puppets will get poisoned.

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Hope you enjoy my little speech ='')).