You've been mentioning this for a while, but has there been a DC for a spring movie?
I recall LGKR had different angles for some scenes in magazines and we never had one.
Chou Den-O & Decade had a DC, neither Den-O Trilogy nor Let's Go Kamen Riders got DCs. All the movies that did not get DCs though had credits separated from the movie footage for their original cut - because separating credits from the movie is a feature that Toei always advertises for their DCs, so, if there's no DC, they include the clean footage in the original cut itself. Meanwhile, in Super Hero Taisen, the credits and ending song were mixed with the footage of the final scenes, just like in the summer movies and winter movies, which have DCs.
The movies without DCs also didn't have movie footage in trailers that wasn't used in the movies themselves, or even scenes advertised in magazines that weren't in the movie at all (They did have advertisement for some underwhelming scenes though, like the Decade vs Shadowmoon battle in Let's Go Kamen Rider, but that's a different matter), unlike the W and Accel stuff here. On the other hand, we have already seen magazines leaking scenes that only were seen in the DC, like Decade's partial arm transformation in Movie Wars 2010.
Different angles or even special poses for promo shots are rather common though - even Megamax had a group shot including all Riders together, minus Poseidon, something that never happened even in the DC. However, I think the promo shot with Daguba is interesting because it's in the location of the final battle, and yet the Daguba suit itself isn't even present in any of the group shots there or any of the smaller fighting scenes there. So, it apparently wasn't easily available or a suit they threw in randomly. Also, all other suits shown in the picture there seem to be specifically from commander-type Rider villains who weren't destroyed on screen in the footage we have now, which seems to be too coincidental.
In addition to Daguba, there's Joker, King Orphenoc, Llumu Quimil and the El of Earth... Everything seems to line up for there being some unseen footage where Dai-Shocker's remaining commanders are destroyed on screen. It might just turn out to be a coincidence though, and even if there's a DC, that group shot might be just a promotional image, unrelated to any movie scenes, but it seems awfully specific, especially considering the location, choice of suits, and the absence of Daguba's suit in group shots. Also, it's not from a magazine, but from the Dai-Shocker page in the movie booklet, every single other shot from that section was taken from the movie itself.
Even the one cut scene that we have completely confirmed right now thanks to the trailers, with W and Accel, was supposed to show them defeating the Black Cross King according to the magazines. So it makes sense that there's some unseen footage showing the remaining Rider commander monsters being defeated too.
I guess the big thing against that one group shot with Daguba being an actual scene is just the timing. Joker is shown to be alive while the Gokaiger destroy Hunter Silver. So, that likely means that the scene would need to come
after Bio Hunter Silver is destroyed at least, if it's really supposed to be a scene where they're destroyed. On the other hand, that's an assumption on top of an assumption. Even if it's a real scene, I might be mistaken about its point, which could allow it to come earlier. Or it might just come afterwards, but I'll be surprised if they cut some kind of "finish off all the remaining villains!" scene by that point of the movie.