An "equal partner" reflects a corps that's balanced enough to showcase all lines. But it could also equally mean writing to showcase the drums ends up being an education in technical ability instead of a supporting role for the show overall. Crown's drum feature, particularly in meter separation, was outstanding to my ear; the percussive sideline voices made it all that much better, IMO, for all of you who hated the narration, and tied the drum line to the original Eotb theme.
It's interesting to hear you say that Hannum's book left no room for error. This year's book was remarkably less demanding, IMO, than Cadets and, after watching them both live more than once and after watching plenty of lot videos, it's clear to me that the chance for muddying-up the execution was much higher with the drum lines above Crown. I've always contended that an open, exposed drum book, done well, is just as impressive as a complicated black-smudge of notes on the page. That's where Hannum excels to my ear, because his writing makes sense with the show theme and what the brass is playing. I love an intense drumline, but I like a cohesive, musical presentation that supports the show theme even more. That, to me, is where Hannum's writing was top notch, even if the execution was 6th place.
You again say "...some adjustments on the field..." but I hear that from every drum line. Every corps can make adjustments to improve their field or box scores, so I don't see how Crown is exceptional in that this year.