I know! Like, maybe somebody decided that Chicago needed a Marcone, and if it didn't have one, they'd just make one? Or Marcone is some kind of tiger god/spirit creature who locked himself into a human lifetime through the drawing? Or maybe he's actually much more powerful than he knows, and somebody used the drawing to bind him when he was small, and the damage to the drawing was the first crack in the binding...

One way or another, it's clearly relevant!