The last season of confirmed that every alternate-world character was a variant of the prime universe person. This meant that the actor who played Sam in the “French Mistake” world was another version of the character who should have been present when Sam and Dean arrived.
However, this variant was never seen, and it appeared that Sam had simply replaced him. It’s a as well, as his variant didn’t show up either. Sam would later encounter another variant of his without either one replacing the other, so it’s unclear why the “French Mistake” version didn’t show up.
Sam repeatedly claimed that he wasn’t going to let go of his college friends even when he was traveling with Dean; he was shown at one point texting them. Sam continued to harbor hopes of returning to a normal life, which clashes with the disappearance of his college friends.
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