Like I said that option is up to you. I just find that with this build and the Def skills I do not take enough dmg to make Purifying Chastisement worth while vs the Dopples extra dmg output. That and I gave my Dopple the Gruesome Inquisition tree line so he is more or less the 3rd skill line for me lol. but like I said if you look at the way it works out, there is plenty you can move around and still keep it and effective and fun build with a play style more to your liking. I find the survivability is higher this way then with other builds I have tried.
Guess what I am saying is my primary intention was to make a build that didn't take hardly any dmg thus making Purifying Chastisement not needed so I opted to take the Perma Dopple and use him for extra dmg output and crowd control. I hope this clears up my point of view on it. But try the build and mod it your way who knows maybe we will find the Perfect build (if there is such a thing LOL). I just Posted My Idea so that maybe it will help people get a base on what they want. If there is any other questions plz ask away. I will be happy to state my opinion.
I do However see where your going with that and I may make my 8th inquis and mod him to give this a try. Thank you for your opinion.