Questions about kamen rider Den-o

[alpha red]

hi, can anybody tell me all the stories of sakurai yuuto, i want to get a picture of the overall timeline of sakurai, n how they are inter-related. the sakurai yuuto that travel to yr 2007 to assist Ryoutarou, the sakurai yuuto that appear in the past everytime the imagine fly to, the sakurai yuuto that sacrifice himself at the lake, the sakurai yuuto at hana's destroyed timeline... how are all of them inter-related? can anyone tell me abt it?

 

[alpha red]

hi, another question i'd like to ask is about kai.. how he travel inside time? how he travel to the imagine world to bring the imagine to 2007? since the imagin world is destroyed, why the imagine stil not disappeared, but only loss their physical form n stil existed as a ball of yellow light? i know that kai is a singularity point, then how come he disappear at the last episode when the death imagin was defeated.. if he is a singular point, i think he is not affected by the imagin missing.. then why is he missing as well? fading from existence? anybody knows?

i would like to know the overall story abt sakurai yuuto n kai..