Alright. Just we can assume the Equestrian trio's Lockseeds aren't run of the mill ones, given Kouta himself made them, and thus are probably they're a bit stronger than an average Armored Rider. so Ryugen feels like he needs something to keep him up with the others who've already gotten their midseason upgrades and super modes.
Just an idea, given we know that Micchy was holding onto the Melon Energy Lockseed (when he threw it to his brother in Megamax), perhaps give him Jinba Melon Arms using a left over Genesis Core (since Ryoma only fried the drivers) until Takatora gets a new Genesis Driver in the movie's events to keep him up with the other Riders? Just an idea.
Hmm, that's a good question. I'm not sure. Of course Megan is already an experienced fighter, while Takeru was still a bit of a rookie compared to Spectre, so Megan likely would likely be a bit even. But could make one up.