THEORY BCS I CANT POST ON ANY DELTARUNE SUBREDDIT😭😂🎉🅱️ - Dont Forget" at end of Ch. 4

At the end of chapter 4 the voice on the phone says "Dont forget" which as we know is a theme of Deltarune with the song named "Dont forget" playing at the end of the chapters after credits usually. I think there is more to the person saying this, i have a theory, a game theory.

In Sans lab or secret room (idk the proper name for it) in Undertale it has a drawer that when you interact with it it says the following-

• (There's a photo album inside the drawer.)
• (There are photos of Sans with a lot of people you don't recognize.)
• (... and, one photo of you standing with Sans and all your friends.)
• (He looks happy.)

However if you meet and talk to Clamgirl, one of Gasters followers, it will say this-

• (There's a photo album inside the drawer.)
• (There are photos of... Huh?)
• (A card is sticking out from the back flap of the binder.)
• (It's a poorly drawn picture of three smiling people.)
• (Written on it...)
• "don't forget.”

The same thing that the person on the phone says at the end of chapter 4 of Deltarune. I believe that man is Gaster. There are many things that point to this such as when you call in the Darkworld "garbage noise" plays which is associated with Gaster because when the addisons talk about how they found Spamtons phone after he was drove to madness they say the receiver just had "Garbage noise" so Gaster has a history with phones. BONUS: Tenna may also be talking to Gaster throughout chapter 3 on the phone.

So now that we have established for the sake of this theory that Gaster is on the phone and does infact tells Kris "dont forget" We can now go back to the photo of the three people who as Frisk in Undertale, you dont recognize that has "dont forget" on the back those three people could be a few different combinations

1. Kris, Susie, and Ralsei Very straight forward and makes sense with the words dont forget as they are tied into their story and Kris is literally told "dont forget" at the end of ch. 4

2. Kris, Sans, and some other third person This would support the theory that Sans is originally from the Deltarune universe because he bleeds unlike all the other monsters in Undertale and his door looks strikingly similar with the fire like stuff coming out from under his door. Also Sans is completely unchanged from Undertale unlike many other Undertale characters in Deltarune, for example, Undyne and Alphys. If this is his original world, why would he be changed? Also dialogue in Undertale states how Sans and Papyrus just showed up one day, and Papyrus remembers there being grass where he was originally from.

3. (Sans???), Gaster, and Kris This one may be a reach since it hinges on a few other theories that are unproven. For this one to make sense, again, Sans would have to have from the Deltarune world originally. As well as that theory another one comes into play, The Experiment theory. This theory states one day Kris went into the bunker one day it was open when he was younger. Gaster being inside of it, possibly being his lab. (Gaster is thought to be inside of the bunker because of the garbage noise that plays and is slowed by 666% the number 6 being part of Gaster in Undertale and Deltarune). The experiment may be either the Vessel we build at the beginning of the game OR the experiment that made Kris to be controlled by us, like being controlled by strings. This is supported by Kris’ reaction after defeating Neo Spamton and him saying

• It seems after all I couldn't be anything more than a simple puppet.
• But you three... You're strong.
• Maybe you three can break your own strings.

Kris is visibly upset and unsettled by this, even Susie and Ralsei notice. Kris knows he is being controlled, maybe he wants to break these strings put on to him by the experiment.

With this group Sans could be a few other people as well. Maybe Dess, as others have speculated he was also experimented on. Maybe others, I am not sure

Thoughts? Comments?