And now Hunter believes the Stoke-on-Trent-born half-back can help carry the Under-20s to new levels in the upcoming world competition in South Africa.
Robson is making great strides with the Cherry and Whites, and the 20-year-old will compete with All Black World Cup winner Jimmy Cowan and Dave Lewis for the number nine shirt next term, as his first team Kingsholm impact increases.
Gloucester trio Robson, centre Ryan Mills and hooker Koree Britton have all once again made Hunter's squad.
All three were involved in last year's world contest, where England lost out to New Zealand in the final.
England face Italy, Ireland and South Africa in the space of eight days, starting on June 4, and Hunter anticipates a fierce battle to progress from Pool B.
And he believes it is men like Robson - who know how to push his squad in the right direction - who will be to the fore if England are to enjoy a fruitful campaign.
Hunter said the Under-20s coaches have steadily increased the responsibilities on their players, in a bid to boost both their game sense and their leadership skills.
While one aim is to see the players profit in the long-run, Hunter said he also hopes it will pay dividend out in South Africa.
"Dan was probably the standout performer from the Six Nations to be honest.
"He really stepped up a level, and not just in his performances on the field.
"We've asked the players to take high levels of responsibility, we've asked them to lead analysis sessions, asking them to present the problems from matches as they see them, and then talk about how we tackle them.
"And it's worked very well. Dan has been at the forefront of things like that, but also in training, and then on the field too, he has really come forward as a leader, and he has demanded certain levels of himself, but also the others too.
"It has really rubbed off on others, and they have take extra steps with him.
"When players get to that point where they start to move forward like that themselves, of their own accord, that's when we know we're on the right track as coaches in the age-groups.
"Of course we want to win the competitions we enter, that's a huge aim.
"But also, our other huge role here is to help prepare these players for higher levels, both the Premiership and beyond.
"And we've got to work as hard as we can with them to prepare them for, hopefully, going all the way through the England system right to the full national side.
"The more players who graduate from the Under-20s to full recognition, in some respect, the more successful we become."
Hunter said England can only progress from their pool if they deploy their full resources smartly.
"We've got a very demanding fixture programme in the pool, and we know that we must use all our resources in order to produce our best rugby.
"It will be a massive test for us, but we've seen these players develop well over the season and we're very excited by the challenges ahead."
Content courtesy of Gloucester Citizen