Dont understand about danzaburo skill point no 3

[averagejoe33]

Danzaburo - is he worth it?

I have this heroe and tested him. For analysis He have 3 differents effects That he can pull of: damage all ennemies and blind them, this attack is stronger than Hu Tao and Justice (on the dmg porcentage) the blind effect is also the strongest out of all heroes -54% but on only 3 turns (justice have 4 turns) boost your team with a very strong defense buff and mana buff. Defense buff as strong as vivica. cannot up mana for 2 turns This heroe is a double edged sword. But 66% of the time…

Some other opinions here mate. I am still unsure whether to bother upgrading Danzaburo!