By the end of Marathon RED, Paco has become an immortal wanderer, having returned to his old body (I guess there was a soul transfer involved with his Reaver form, not body horror) and apparently taken Joshua’s cloak. Appropriate, since it’s implied that he’s now in Joshua’s and Michael’s league.
Worked his appearance in the ending around my speculative Reaver design, which is incompatible with whatever happened canonically. I swiftly ran into a snag–Paco’s armoured again, but his torso-blades wouldn’t fit in there. The solution was to move them to his back, to better mirror his armour-tubing (when I first drew Paco, I’d mistaken those bits as being part of his shoulder pads).