I think Mimic actually quadruples the effect of a trinket. I had 1 legacy, starting harpoon, and got slight and glow from the trinket collector. I got Frarp from an earlier amphibian game ship and have a totally normal crew at ship "9"
Also, if "Grow" would +1 a cargo piece that's value 1, Carp's repair ability would still trigger. Is this even intentional???