The cartridge is Red's. It was in Red's Divine Artifact when it was stolen, and it holds the Yamata No Orochi ability (the one with all the fiery dragons). Tokita used it with his gun replica during the fight with Peltrola, presumably after Suzukiri offered it to him. Basically, she says that he can't turn her in because by choosing to use it in that fight, he is also incriminated. Even if he didn't get in trouble, tattling would probably mean he has to give the cartridge back to Red immediately. (I assume only Red knows all the cartridges were in the tool when it was stolen, which is why Tokita wasn't afraid to use it in front of the Juniors. They probably just assumed Red gave it to him.)

Supplementary info/manga changes 3:32 - L is one and was shown in Episode 1. 3:50 - Back in Episode 1, the Dusters mention that they made a lion 7 years ago, so D was that fake Executive. 8:57 - D and Blue were talking at the same time, with D telling him to heal with the Dragon God and Blue saying that he lost to the real deal, since he was bad at being good and evil. Anime original scenes of Dairyu’s first appearance as the JFR (acting) and Red being the worst, a Red member talking to someone and foreshadowing cool stuff, and one more with a hooded figure listening to the radio. A certain scene was likely moved to next Season, so they can have it be a complete scene. In the manga, they showed the colorless rookies (Yamato specifically) having to say on TV that an invader killed Ishikawa and had to keep quiet about Peltrola. The prologue is over and now the real fight begins (the official Twitter for the anime even says that ‘the real action begins now’) next year. Bailong arc is considered the lowest part of the series (the arc is really long in the manga) and it’s only up from here.

Really enjoying your theories.

Despite my problems with the adaption it still served its purpose of bringing more people to this amazing series. Hope you guys continue with s2 whenever that comes out.