Your top 5 is your top 5 so I'm not mad at any of your choices but Cena wasn't as big as Hogan.
Hogan was massive, everyone in the world knew Hulk Hogan for the most part whether you knew wrestling or not, he was in Rocky 3 and he was a megastar, like there's people who didn't know wrestling but knew Hogan, Hogan was THE star at 1 point to the point where he transcended the sport, he was the key man associated with wrestling at 1 point more than anybody.
I know older people who have no idea who John Cena is but everyone knows Hulk Hogan. Cena's era was getting a lot less viewers so it's not the same, Hogan was major. There's not 1 Cena match that was bigger than Hogan vs Andre The Giant or for that matter The Rock vs Hogan.
Hogan changed the industry, twice, with Hulkamnia and then with the N.W.O shyt, he gave WCW the star power and credibility.
I don't know your age but Hulk Hogan was a phenomon, he was gigantic, overall he might be the biggest wrestler ever, doesn't mean he's a good person but he may well be the biggest wrestler ever, The Rock and Austin had huge peaks but Hogan did shyt over a long ass time and he changed the whole game. Austin had a relatively short run on top. Rock being a movie star made him very big. Hogan though was so huge, he was the 1 wrestler everyone knew at 1 point.