Despite some of the show's contestants being lucky to hear a word from their mentors once the show is over, Gary has been working with both Marcus and Craig on their debut albums, writing songs and spending time in the studio with them.
Gary will be producing Marcus' debut single, Seven Nation Army, and album, which are bot out next month.
"I look up to him like he's my dad. He's unbelievable, such a nice guy," Marcus told The Sun today. "I speak to him all the time — I called the other day just to check in."
From this Saturday however Marcus will be taking a break from recording to take part in The X Factor tour, and it sounds as though the rivalry between singers is even stronger!
He added: "People are raring to go and don't want to be forgotten."