I realize this is constrained somewhat by what the prosecutors can actually prove... but it seems like the person in question should go to jail for outright fraud and identity theft.
I don't think the FTC can prosecute someone for criminal charges, regardless of proof. They would need the DoJ or an US Attorney to follow up on those. AFAIK, IANAL.
I think the DOJ could potentially build off of this case, though.
Amateur question : would that fall under double jeopardy ?
IANAL but no, double jeopardy only applies to criminal cases
Are there ways we as citizens can push them to follow up on this?