The 22-year-old entrepreneur, who was hugged and kissed by Aaron when they were reunited, said Aaron deserved to win.
Harry said on Big Brother's Bit on the Side: "Yeah, the guy will go down as a legend.
"Whether he was playing a game or not, he won it. It's a gameshow at the end of the day. You can't please everybody."
Tom O'Connell was more negative, saying: "I think the strops and the moods were actually the most genuine part of Aaron. He does get offended by things very easily. So when we were all talking about s**t and p*ss, he was genuinely upset."
Digital Spy readers tipped Allard-Morgan to beat fellow finalists Jay Mckray, Louise Cliffe and bookies' favourite Alex Rose in last night's grand final.
> Brian Dowling: 'Big Brother would've been boring without Aaron'
> Big Brother winner Aaron: 'I wasn't playing a game'