I mean, if you actually think about it, both Gai and Dillon are the "lone wolves" of the team. Gai dies in the ending of Jetman, and in Eddie's finale for RPM, Dillon was supposed to die.
The tone for RPM was different from any other PR series, way different from Saban's series in my opinion, especially since we had new blood controlling the show for the first half of the season. Jetman's tone was a different tone from any other Sentai I've seen. I heard that Maskman had the same tone, but I won't say since I haven't seen Maskman yet. But both Jetman and RPM had the same kind of tone.
I can't really think of anything else at the moment. But I'll update when I do. And if anyone has something to contribute to it, don't be afraid to leave a comment and I'll update giving credit to you.