About the SA it does make a lot of sense. He mentioned his personality as Randal is fake and the real him is coming out. I guess the reason why he made a new personality. So he wouldn't be the same guy who got SAed .
Also, the prologue of a new game has come out, Red embrace:m- something. The protagonist was supposed to be a gol but she's a part of the 4th house. Mayybeeee that's the house he's in.
OR theory. Randal was bitten by multiple vamps at the same time. So he's a hybrid of Isi and Gol.