That's a scary thought, with the 21-year-old having already taken the NRL and State of Origin arena by storm, notching 26 tries in 37 games for the Broncos and two in four appearances for the Maroons.
When Cobbo does take that next step it will be with a nod to previous Indigenous players who have blazed a trail for the Broncos and Queensland, Renouf says.
The Brisbane legend and Cobbo were together at training on Tuesday to unveil the Indigenous-themed jersey the players will wear on Saturday night in the club's Deadly Choices round against Newcastle at Suncorp Stadium.
The duo have worked together at the Indigenous health initiative Deadly Choices that promotes healthy lifestyles in communities.
Cobbo hails from Cherbourg, next door to Renouf's old stomping ground of Murgon.
"Selwyn is standing on the shoulder of giants and doing it so well," Renouf said on Tuesday.
"We have had so many great Indigenous players come through the Broncos since 1988, like Colin Scott, Joe Kilroy, Tony Currie and Dale Shearer.
"I played with my idols and followed on their coat tails, then with guys like Wendell (Sailor) and Gorden Tallis.
"Selwyn is blazing his own trail and doing all those greats proud."
Renouf said he had "no doubt" the young back has plenty of improvement left in him.
"I remember working with Deadly Choices and Selwyn would come in," renouf said.
"I'd heard about his training and how he was very different to me and a good trainer. It took me a while to get going.
"That shows the character of the man Selwyn is and the maturity he has gained pretty quickly."
For his part, Cobbo said it was "very special" to follow in his mentor's footsteps.
"Me and Steve both grew up in the same area," he said.
"Now I have the opportunity to play at the same club he did.
"My dad (Shamus) always talked about him and how good he was.
"As a kid you always have that one person you always looked up to, and mine was Greg Inglis.
"I loved how he performed and what he also did off the field for his community and us mob. I always wanted to be like him."
Cobbo is doing a good job of that. He scored two tries in Queensland's 26-18 Origin I win over NSW in Adelaide, the second with a grin from ear to ear while sliding inches from the sideline.
"He knows exactly what he is doing," Renouf said.
"Selwyn is a proud Cherbourg boy. I am from Murgon and that's the style of footy we play."
Cobbo agreed he had only scratched the surface of what he could achieve.
"I feel like there is more coming," he said.
"Last year was my first proper NRL season. I know what it is like now."
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