I'm to lazy to keep doing this so here's a তালিকা of all my theories and some evidence.
-Dipper's real name is Issac. In Fight Fighters, Dipper enters the initials D.I.P, which could stand for "Dipper" Issac Pines.
-Gideon is a vampire. In Weirdmegenton 1, Gideon says, "She was always meant to be mine". I guess this means that he's a vampire cause ভ্যাম্পায়ার are immortal. There is also other stuff that supports this and আপনি can look it up on YouTube, but I can't help আপনি there.
-Bill is still in Dipper's mind. In Northwest Manor Mystery, Dipper reacts to Mcguckets warning with the line, "Let's have some fun for once". He doesn't care and he walks of with his fits on his hips a thing only Bill did when he was possessing Dipper. Also in Stan's Not What He Seems, there is that one scene where Dipper's eyes look like how they did in মোজা Opera when Bill was possessing Dipper.
Um...I can't think of anything else. So, I'll just get back to পাঠ করা and লেখা fanfics.

Bill has found Hazel, Mabel, and Dipper and has made a little family reunion but with who? Mabel and Dipper অথবা Hazel? Well, the danger is growing as Bill makes a deal with one of them. But, will they accept it? Hazel has a secret and the others know it. Will it make her a threat অথবা will it help the Pine Twins? These প্রশ্ন and আরো will be answered in Gravity Falls: The Years Afterward Part :2.
It will get very crazy because I read a bunch of fanfictions about Bill and the Pine Twins so be prepared!