I love that you are doing all this vocal stuff. I am trying to learn recording/mixing vocals and stuff like this helps so much understand what a raw track should sound like and what the layers sound like underneath the music.
His straight harsh vocals have never been the greatest honestly, but his clean singing makes up for it, when he does those sung/distorded pitched screams it's actually insane
it's basically useless if you want to put it on a backing track, unless you want to cut every part and find the right spots, it could have been done better