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John Cena just performed a heartwarming gesture before his retirement. A WWE personality has thanked him for this.Tyson Kidd currently works as a producer in WWE. He took on the role after his in-ring retirement. Outside of the sports entertainment juggernaut, Tyson and his wife, Natalya, run their wrestling school called Dungeon 2.0, which is their own version of the Hart Dungeon founded by Stu Hart. Natalya and Tyson Kidd spend a lot of their time training aspiring wrestlers at their wrestling school. Recently, Cena visited Dungeon 2.0 to interact with some of the students and take some photos. Following this visit, Cena took to social media to pen a heartfelt message about The Dungeon. Tyson Kidd responded to this by thanking the former WWE Champion for being selfless with his time."John, I can’t thank you enough!! For coming through and being completely selfless with both your time and information. Best part of all-it was you that wanted to come and do that on your own accord. Says a lot about you. John Cena is truly one of a kind," wrote Tyson Kidd.Check out his tweet here:Tommy Carlucci believes Rey Mysterio should be John Cena's final opponentEver since John Cena announced his retirement tour, fans have speculated regarding who will be his final opponent. At Saturday Night's Main Event, Cena announced in a video package that there would be a tournament to determine who would face him in his final match.Speaking on The Coach and Bro Show, Tommy Carlucci suggested that Rey Mysterio should be Cena's final opponent since they could have a fun match."Personally, I think him [John Cena] and Rey Mysterio can have a great match. Rey is a Hall of Famer. They've had history before. And by the way, that name pops. I mean, when you tell me my last match is Cena and Rey Mysterio, that makes me say, 'Holy s**t again, what are they going to do?" Carlucci said.It remains to be seen who will earn the right to face Cena in his retirement match.