Do you think that is Maine (The Meta) at the end of the episode or Tex?
Keep in mind that we never saw the Meta die (like a fall from a cliff will kill him after all he's been through prior to that event) and the person at the end has black armour which it Tex's colour.
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I actually think it may be one of the Insurrectionists from season 9 and 10. Didn't he have green as a secondary too? So maybe he infiltrated the army and is undercover? I feel like the Freelancers are sort of done now that most of the core group are gone and I'd like to see the Insurrectionists have more screen time since they were like a counterpart to the Freelancers.