With Reynolds out injured, the 22-year-old halfback had a stunning club debut in the 35-31 loss to North Queensland on Friday night.
He kicked five goals from as many attempts, landed a pressure field goal that put the Broncos ahead 31-30, and laid on two try assists.
Reynolds will retire at the end of the season and the Broncos have signed Parramatta playmaker Jonah Pezet as his possible successor. Veteran half Ben Hunt is also keen to play on in 2027.
When asked about the challenge of unseating Pezet, the former Cowboys half was determined and humble.
"I've come here to play NRL," he said.
"If that means doing 10 weeks in the Q Cup and just learning my craft and trying to perform really at a high level in that competition, then that's what I'm going to do.
"Or if that's getting a crack at NRL and leading the boys around, I'm happy to do that as well.
"Halves don't really mature and come good until that 26, 27 sort of age so I've got plenty of years to hit my prime.
"In the meantime it's head down, arse up and I'm just going to keep working."
Reynolds, who is hopeful of returning to play Wests Tigers in Campbelltown on Saturday night, has been passing on his wisdom.
"He's a great fella and you can just sit down and have a coffee and talk footy or even just talk about life with him," Duffy said.
"Just watching him and training with him and Dozer (Hunt) … you just learn stuff being so close to them that you otherwise wouldn't."
Duffy, who became the 300th Bronco to debut, said he had also thrived under the tutelage of attack coach and former NRL half Trent Barrett.
His manager Sam Ayoub has opened talks with the Broncos to extend Duffy, who initially signed a one-year deal.
"It's just a massive club, to be honest," Duffy when asked why he wanted to stay.
"They've got really good people in and around the club and lots of connections. My partner moved in the new year and she's loving life here. It's been a good move on and off the field."
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