Originally Posted by ask me anything
^ Ichigo wasn't able to use the mask at first either, but he trained with the vizards until he could. I think he will find a way to control his full hollow mode before its all over, just not anytime soon, (at least not in this battle).
IMO, isshin is about as strong as ichigo with his mask on. Ichigo in full hollow mode is way stronger.
Not to ruin anyone's parade but ichigo is one of the weakest if not the weaker of all the good guys, every single win up to this point has being due to PNJ and not to his skill.
Lets recap ichigo abilities, he has 1 skill(Tetsuga Tensho) he needs his Bankai to keep up with other people shikai and needs a mask to somehow keep up with their bankai, and even with the mask on he falls short and only wins because no one takes him seriously so they toy with him until Kubo pulls a fake rabit and makes ichigo win by force of plot.
Ishiin with only his UNrelease sword(not even Shikai in case you didn't get it) is keeping up with Aizen and is able to "FLICK" aizen off , remember that Ichigo with Bankai couldn't even touch Aizen and got Owned bared handed in the SS ark.
So anyone that puts Ishiin and Ichigo on the same level(or call Ichigo stronger) is seriously just 1-) on crack or 2-) has been reading a different manga than i have.