the thing(s) about changing the future are...
-will we ever see any of these people again down the road? Some yes some no, place your bets on whether or not Tet and his gang of 'toughs' resurface at some point.
-body counts are going to be fudgeable. All those people Batsy killed to get the keychain? Don't worry about it. Thanks Den-liner's time travel ability, most of them are alive now. Seriously, they're going to have closely watch who they kill in the past and how many people die because otherwise they'll trip over themselves down the road.
-Tet (if he resurfaces) vs. FF#1 & 2. I'm calling it now, he's going to throw down with one or the other if he shows up again.
-Mysterious man. Eh, he's either the owner (at some point, not present owner), creator of Denliner (and perhaps the den system/belt) and/or Naomi/Hanna's father.
-Finally evidence that Naomi's coffee is horrible, w/ Momotaru's reaction. And Naomi's outfit... yeah, that doesn't hide much if at all.
Next time on Kamen Rider Deno:
More people kind of die but not really.
Gekiranger's evil gets a headstart.
More bad coffee vs Kasumi's awesome coffee.
And Momo goes "Pimp my Ryo" not guest-starring Mad Mike.
Actually wouldn't they be dead?
They died in the present.
The Den-Liner can't really fix what happened in the past. Bat Imajin frucked up the past in that way and they are probably dead. Or...eh, if you want to get technical, they could of saved Tets, then went BACK in time after they let Tets see his mother where Bat Imajin doesn't...well...
Eh, God. Too confusing, but already Den-O shows how to do a future plot better than Kabuto's crap clusterfuck.
And pretty sure we'll see Tets again.
He'll probably be a good guy; maybe Ryo's friend. His gang may be the same - maybe not. Tets influence may change them all
It'll be interesting.
And pretty sure we'll not get a weekly kajin.
To get back in time, ect, get back into someone's past will take 2 to 3 episodes.