It's not "ganging up" on anyone, nor summary execution. In a well written Sentai, the team are equal in strength and power (i.e. NOT "Red is the strongest and bravest and the one chosen by destiny!!!"), so one on one wouldn't be a fair fight - no one would be strong enough to defeat the villain alone.
From the Sentai I've seen there was not a single one where everyone was of equal strength.
Regardless, Kyoryu wasn't written with Daigo and Deboss being a fair fight. Fairness doesn't simply come with physical strength, but also with circumstance. They had to go through hell (for some of them, literally) to get there.
I think that sends a better message, because in real life, when there's a challenge that's seemingly insurmountable, sometimes combining your strengths to challenge it is not enough. The answer is finding and executing the proper plan that will give you the most chance of success. And yes, sometimes only one person gets the spotlight, but as long as you all acknowledged what you did as a team, then that's fine.
but what you did not realize that this has been happening in Sentai since the day it started. what you also DID NOT realize is that they purposely make the team weak even when they work together and the monster stronger because they DID NOT want the audience to think the heroes were ganging up on the monster and being bullies. by the way, this has been confirmed in an interview by the actors of Akaranger and Aoranger.
I know that happens that's why I call it a trope.
Regardless, Kyoryu is not alone in this, so clearly the idea is NOT the metaphor that five people beating on one person means teamwork, but the more general idea of teamwork itself. I think the former is falling back on the trope (i.e. it's lazy as hell) and is done to showcase action more than the lesson itself. And in terms of showcasing the lesson, I thought Kyoryu did just fine.
I don't mind if Red is still going to end up fighting the final villain alone, as long as his teammates were also there with him until the end and not elsewhere doing their own thing.
Whew, and here I thought you were talking about Kyoryuger, because that didn't happen there at all.
and your comment of "wanting to see Sanjo writing another Sentai just to see how non-Japanese fans would go berserk" is just so, so dickish. really, it's uncalled for. but to avoid infraction, I'm just going to stop here.
Seeing as neither of Sanjo writing nor fans going berserk is under my control, I don't see how that's my fault. Still, I'm sorry if it caused any offense.