Jessica Hoopsick, a sex worker who had a relationship with Wells, confesses in the series' final moments that she suggested Wells to Barnes because of his kind and unquestioning nature. Barnes, in his own confession, agrees that Wells was mostly innocent, but that he was still aware of the scheme.
But Diehl-Armstrong, who grew close with Evil Genius director Trey Borzillieri during the course of their years-long correspondence, says that Wells was more involved that anyone knows, pointing to his casual demeanor during the crime.
Diehl-Armstrong had a vested interest in portraying Wells as a co-conspirator, because it meant she couldn't face the death penalty, and both Diehl-Armstrong and Wells could have had monetary motives for robbing a bank. But, as certain elements of the crime suggest, money was never the true objective here, and Wells was always going to die. Whether or not he was involved at any point, he was certainly a victim.