The only negative I have about this episode is the fact that this one, the one before it, and the next one are all focused mostly on the Phantom Thieves. In this episode, I can tell Keiichiro is tired of being on the sidelines. The Thieves are getting a bigger and bigger arsenal as the days pass, and the cops aren't any closer to ending things unless they start getting serious about collecting Lupin Collection pieces themselves.
So if we're talking theories, I have a feeling we're going to see things change for the PatRangers pretty soon. Either they're going to claim the Splash Trigger Machine for themselves (seriously, it even looks like a cop when it combines), or the cops are going to get their own Dial Fighter to even things out. Who knows, this coming episode may lead to the cops getting something new for their arsenal, even though the story will be mostly focused on the Thieves.
And I still believe that by the end of the series, it'll be revealed that the LupinRangers and the PatRangers were always meant to be part of the same team, possibly with a different name to reflect the the two teams united as one. They both use VS Changers, they both use Lupin Collection pieces in their arsenals, they can swap out Dial Fighters/Trigger Machines for virtually any Kaiser combination. I deeply believe that's the direction they are going. But if the show proves me wrong and keeps them as 2 separate teams by the end of the show, I'll actually applaud the creators for doing that. It'll definitely elevate the series above "Meh" status for me.