“to help him navigate his dramatic role as a potential witness in the investigation of President Trump’s campaign and potential obstruction of justice”
You need a lawyer just in case you get called to be a witness in the possibility of a crime being identified?
Sounds more like he is worried about facing charges for leaking classified information.
What isn’t being noted is that Fitzgerald is a potential witness in any case regarding Comey and the latter’s abuse of prosecutorial power to political ends.
He’s trying to shield a witness by making him his lawyer - same technique Clinton used with Cheryl Mills.