Ricky, Axel, + Magnus
Between the 3, Magnus is the doomed one, unable to safely lower his facade.
Ricky goes into a con, he pulls off a scam, but once exposed, he pays the price, whether at Wormwood Scrubs, Holloway Prison, or elsewhere, then he moves on, and is reborn again.
Axel plays his cards extremely well, and knows when it's time to fold. But his concern for Pym's well-being falls on deaf ears.
Pym's game is the most dangerous, and becomes fatal, because he tries to be all things to all people. When the inevitable truth closes in on Pym, as he unmasks himself, he shatters his own visage.
To be an effective double-agent, an effective traitor, one must be full of love for someone, something, and likewise full of hatred for another. Magnus Pym's Achilles' heel was that he was lacking in this quality.