[chaos42]

i have a theory
First the person who we think is Sento Kiryu is really Takumi Katsuragi who's face was changed by Bloody Stark. Consider that one Taro Satou is not a scientist he is a rock and roll punk who when in for a study to earn some cash so here is the thing how do you get smarter from that i don't think this guy just wanted to be a rock and roll star but was also a brilliant scientist i think that these are two different people. Now Here is the question how did he get smarter as drugs make increase your intelligence but actual knowledge isn't something a drug will give you. Now its possible the info is implanted but we haven't seen that yet. So i think what happened is this


The real Taro when to Katsuragi's place but stark was the one who had put up that ad and was waiting he knocked him out and killed him but then changed his face to that of Katsuragi and left him there for Ryuga to take the fall for the murder. He either then or had already wipe his memories of Katsuragi and had intended to use him for something else either as a worker to improve the rider system or as a test subject or he deliberately let him go as part of a plan with the cafe store owner to train him and make him stronger so they could create a more powerful build driver system. Either is possible but it would explain things that don't make sense other wise.

One WHY is he so smart when its fairly obvious he wasn't before all this happened
Two Why even though they know where they are they don't do anything
Three why he cried when he hate the food katsuragi's mother made that was seasoned to the tastes her son had
Four Why Stark is letting him have the things they need like bottles to build weapons to work with the rider system and clues like the research data which gives him something to work form

Now there is a possibility that it was a mental download of Katsuragi's mental data into his brain but i think that this is less likely as these researchers on Fausts side don't seem to be making much other than more smash monsters and if their goal is a weaponized kamen rider system then its Build himself making the stuff they would need so i suspect my theory is more likely correct. Why they are doing this is most likely that Katsuragi founded Faust to protect people but the people he worked with most likely who ever bloody stark is double crossed him, also i suspect Stark is Nariaki Utsumi. Consider that he is right near everything and now he is presumed dead he now no longer has to worry about hiding plus he can change faces he could be other people we just haven't figured out who he is pretending to be. as even if he was in the same room as stark it could be some one who's face he changed and then later changed back and either killed them off or they are still waiting around but there isn't much to go on for that part.