Are we confusing chugging with dgenting? Whatever it is, JP uses these techniques very well in the context of the verses, and are very rhythmically complex a lot of the time on this record. It must have taken a while to hash out the timing between the bass, drums, and guitar with these parts in the studio. These type of rhythms can be mind benders to try and learn before they become natural. Even right after the intro to IM when the palm muting part comes in on the low E string, the timing is anything but straight forward. That's one of the easier examples too.
I can't even tell you what a lot of these time sigs are, because I've always played by feel. I never really studied much music theory, to my detriment. I always hated the cliche viewpoint of "oh, music theory makes you mechanical and you don't play from the heart". To me that is absurd, the more knowledge you have, the more you have in your arsenal to work with.
Not knowing something doesn't make one smarter..
IM is a fun song to play for certain... and the muted verse sections are far from straight forward as you say. For me, learning this song has taken it from a song I enjoy hearing to one of the best cuts on the album. There is SO much going on in this song that one can appreciate once one dives in.
This album is really something different, for me anyway. The verses and textures that JP, JMX, and MM are laying down are very intricate and, to my mind anyway, far from repetitive chug. I once heard Tosin explain his style and choices in a percussive manner... meaning he's treating the guitar as a percussive instrument. Seeing that Tosin and JP spend time together during Guitar Universe (Tosin has been a member of all three incarnations I think), JP is likely picking that up. I see JP as a sponge... he's just soaking up what he likes and then making it his own. I'd like to see him continue to use the 8.
Tesseract, to a lesser extent, treat the chug this way too in my ears. Once you move deeper than just the surface impressions, the music and technique is intricate... sometimes very intricate. Altered State, for example, gives me a different impression every time I listen to it.