His jock strap that is because in his prime he couldn't even hold it. GGG is a legend but he just is too old and will ruin his legacy if he keeps going. He should of retired after the first fight where he clearly won and he had already slipped then hence canelo hanging with him.
GGG did win the first fight, was probably slightly past prime even then as he was a fair bit quicker at his best, and more powerful IMO. Prime for Prime GGG wins but I have the trilogy 2-1 Canelo. GGG earned an awful lot from this fight, hopefully he hangs them up now.
What happened with the Great Johnathan Banks, just a superb masterful trainer right there, posts after posts claiming he is so great, Called it.