I highly doubt the shirtless guy at the left is CS. He was a dapper dresser, after he ditched the overalls.
Slacks with sharp creases, dress shirts and Italian loafers at the races was more his style.
I first thought that photo might be Ford's Romeo P.G., as it's banked more than Dearborn P.G. is. (I've spent time on the track at both places.) But, I can't swear to it.