I had to tilt my head a little at how Haruto and Rinko were acting in this episode. Partially because Phantoms seem to retain mannerisms relating back to their Gates all of the time - Beelzebub was clearly still very enthused about composing and artistry, it's just that his medium was now people instead of music; Spriggan was nigh-constantly giving people security tips, etc.
(Even with Phoenix, he didn't necessarily seem to be a total 360 from Yugo. Phoenix was, after all, a really friendly, sociable Phantom who seemed to get along pretty well with a lot of the other Phantoms. He was just also a total bugnuts psychopath.)
But the other thing is that not once did either of them go "But even if he has kept his humanity, he has still tried to kill at least a dozen people and most of Kousuke's social circle." It's not an argument that I think either of them would necessarily find compelling, because Haruto is a Kamen Rider, and they're pretty particular about not killing humans, if they're superpowered human criminals, but it would've been nice to see it come up. Maybe it will next episode.
In general, though, it's an interesting storyline, and one which has a lot of potential as far as expanding on the thus-far-not-expanded-on-much-at-all nature of Phantoms. The idea that Sora is somehow Haruto's mirror image is an interesting one, too.