They only need to be on pt leader if you're using death method, because if death lands while summon is out (which it has 2 of the 4 times I've killed em) it won't take effect unless it's on her.
Otherwise, as long as the person with it equipped is present and alive, you're all good.
I don't have the rare catalog for traps, but I'm 2/4 on ingots with just collecter's *.
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