Is that a cheese wheel?

Yup, that Italian athlete is sponsored by Parmesan

What’s happening in the first picture on the fourth row?

Gojira and the beheaded Marie Antoinette needs to be included. The Korean sharpshooter too. Also, what is the Chinese athlete holding on the leftmost, second-to-the-last row?

They left out the cuban wrestler Mijan Lopez. After winning his fifth consecutive Olympic Gold Medal in his discipline, the Cuban giant retired from wrestling. His sneakers on the middle of the mat were certainly an Olympic image, considering the discipline and his achievements.

Missing the dudes dick hitting the bar, Raygun and Gojira.