For what was a shared ion, Cavendish and Clancy would take very different journeys across their careers on the bike - Clancy the warm and dry, yet harrowingly harsh, wood of the world's velodromes; Cavendish the wet, oil-smudged tarmac of the European continent.
But they bonded as academy riders and housemates.
"It's funny, I still think of Cav as that fella that turned up in a fake Lacoste tracksuit in a Vauxhall Corsa with 21-inch rims on it in on the first day of the academy," smiles Clancy.
"He was a character - larger than life, but he was an inspiration as well. He wasn't that interested in going out and socialising. He had a good party now and again, but he was there for business.
"He always said he was the best in the world even when he was a kid. I just thought he was mental… delusional, even. But I started believing it around that time to be honest. He started winning races that were legit."
But the line used so often in retelling the story of the sporting superstar - that 'you just knew this kid was going to make to it' - was absent with Cavendish.
If anything, you just knew he wasn't.
"I actually think it all started with that academy journey," says Ellingworth. "Mark was funny, and a talker, and he'd hold court.
"He was always messing around, always taking the mick out of people… that Isle of Man humour can touch your bone every now and again.
"As a last-year junior, I couldn't quite understand why this lad hadn't been to the junior worlds and been selected more for the national team. It was very numbers-driven then, and it was very much down the line of: 'If you can't produce the numbers now, you will never be able to produce that engine.'
"And also if somebody's attitude stinks a little bit, do they fit in?"