So this gives some answers for 2026, but still leaves a few questions.
It does appear that the marathon of DanDaDan on 12/27 won't be a "blowoff" marathon, but instead a one-off airing of 8-12 between premiere and encore of the sneak peek, which means we likely still get 9-12 at 2 AM Saturdays beginning 1/3/26
And then Episode 1 of Season 2 with a proper premiere on 1/31/26? If that's right, then that's happening much sooner than I thought! We would then get new episodes of DDD in earnest beginning 2/7/26. Either Beyond The Snow Saga or Mashle S2 end around then, but I would expect Blue Exorcist to go gently into that Blue Night. If DanDaDan and Mashle swap, then maybe Mashle starts over from S1 at 2 AM?
For a little context, Bleach TYBW will be on Part 3 with 7 episodes left and an expected end date of 2/21. We MIGHT roll right into dubs of S4 on 2/28, but I'd say that's highly unlikely given that they coughed/are coughing up the rights to King of the Hill and Futurama at the end of 2025. Hopefully at least the House of Mouse will allow them to rerun Parts 1-3 and maybe they'll take a shot at Part 4 with the 2027 budget.
Blue Exorcist and Mashle both wrap up their current cours on 1/31. Blue Nights are likely for the spring, but Mash will need a replacement. OP keeps on sailing forever and may even be doubled up again at some point.
I think Zom 100 and RATAM are both 13 episodes? Or is RATAM only 10?