Totally.Nago fails as a time traveler.
From what I can infer, after watching ep 28:
Daiga, who helped Wataru in the flashback against the bullies a couple of eps ago, is Maya's son with the King of Fangire, making him a full Fangire. It is very likely Daiga is Kamen Rider Saga, and that he was originally supposed to take the throne, but something happened.
Nago fails as a time traveler.
My theory is simple,Saga ain't Taiga....
IMO,
Taiga=The King of Checkmate four,somehow like Arch Opheroch
Saga=Kengo. After watching 28,i got to admit Kengo have potential to be a rider with his whipping skills.
Taiga was born by Maya with the old King but Maya had an affair with Otoya later and after that was driven out from the checkmate four and stripping of her powers.During the period of time where she was driven out,Otoya and Maya lived normally and one day the King's henchmen found Maya and start to kill her.Maya escapes with her son who is Wataru and slowly...she was found and was missing.
That's my theory
^ Because Go-onger is supose to be an Comedy this year.
Kengo isn't a member of the 3WA who does make Kivatt like henshin devices. the Wonderfull Aozora Organization Doesn't so Kengo being a Rider doesn't even make any sense...
Kivatt the 3th father made an appearance behind Maya's back at the end of the episode when Maya first appeared. it could be that the Kivatt's were created by the Check Mate four...
Also you saw that the Check mate four's living location is in the Castle Doran in episode 28. And it seems reasonable that kivatt the 3th is born in the castle doran. so the Saga kivatt must be born in the castle too.
Nago fails as a time traveler.
How?