pilo said:
There doesn't seem to be any delineation between the different roles of the opening staff but maybe someone here could figure it out? This is how seesaawiki formats the credits so I'm guessing the bottom four names are animators (which are genga and which are douga? is douga even credited?). It also seems most likely that Maeda (whose name is at the top) storyboarded and directed the OP and that Matsubara (the name below his) was the sakkan. Pure conjecture, if anyone knows more then please share your knowledge.

ykskuus said:
Mori Takeshi BD commentary
https://i.imgur.com/PS6Tkq1.png

Sonoda Kenichi BD commentary
https://i.imgur.com/p0DpxHK.png
https://i.imgur.com/J1qM5wa.png