I was so close to being 100% right, but sadly, only 50%

Remember back to my recap of 402 Payment Required:

“Elliot’s friend has never been us, it has been the child version of himself from his surreal dreams, the kid at the desk. There are MANY times where Elliot has said he will need or needs his friend to do things which he will not be able to do alone. The trick is that we see Elliot with his father, just like we have seen Elliot with his friend (see the trip to the beach). The “trick” was assuming the friend was t ”US.” It was not us.

One final option, his third personality is Magda (his Mom).

I would put the odds:

Mohammed <Young Elliot> 40%

Magda 40%”

So, I was half right, the third alter was young Elliot (not Magda).

I was also right about something else:

I mentioned that “the other one” was Tyrell and not an alter (which has been proven to be true). I mentioned this on Reddit:

"The Other One" is a classic Sam Esmaill misdirection. "The Other One" is not an alter, it is Tyrell (notice Magda wants young Elliot to get out of Tyrell's chair from the end of S1 E1”.

Of course, I mentioned that in an article going on and on about my Magda theory (and she still has to be an alter or have some reason to be there, since she was in the scene with young Elliot). So, yes, I am kind of an idiot too (they were both hiding in plain sight but I didn’t make the right choice).

It was not a mystery, but I picked wrong, young Elliot was literally sitting in Tyrell’s chair when Magda told him to move (because the chair belonged to someone else).

Okay, anyway, the third alter is Young Elliot. He was hiding in plain sight and the “other one” was most likely Tyrell (as Magda mentioned in the scene).

Elliot also hid a key when he was a kid, that key, which was kept in a Beavis and Butthead wallet, allowed young Elliot to explain to Older Elliot that he was not actually a passive victim and that he had always been fighting back to the best of his ability.

Fifteen Minutes