Solly is his own flavor of genius. He's insane, but he also managed to go on a rampage in Poland for a decade, killing civilians and evading the police/army. He also predicted that there would be a robot invasion.

and saved Mann Co. installations by tricking them, he was smart enough to infiltrate Gray Co and spy on the robots while winning a picking nose contest, also outsmarted an ancient old powerful wizard and killed Tom Jones , he is a competent exorcist and knows about laws, not the best lawyer