Castagna made a career out of being quick and working hard. He tackled hard, he put pressure on, and created goals for himself and others just by worrying the ball back into Richmond hands. He was cheap in draft and salary cap terms, but he was important in structural terms.

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He emerged as part of that happenstance structure Richmond fell into in 2017 when injuries forced a new method and system. Richmond crafted a new attack built around Riewoldt and a bunch of small and medium forwards with speed and enormous pressure.

Because he was a player of limitations he was a regular whipping boy for fans (as small forwards often are). Kicking five straight behinds in the 2019 grand final, of course, didn’t help, but the same fans adored him for those flaws and what he meant to Richmond. His snap goal in the 2017 grand final was a moment that made the drought-breaking flag seem assured.

If fans were quick to blame Castagna at times, his teammates certainly were not. They loved the player with one of the best nicknames in football – George. Amusingly, Castagna had never watched an episode of Seinfeld when he got to the club and his teammates started to call him George after the Seinfeld character George Costanza. He laughed along, bewildered at how his new teammates were so thick as to confuse Jason with George.

When he announced his retirement at Punt Road on Monday morning, his former teammates and close friends Dan Butler, now at the Saints, and Dave Astbury were in the room. Castagna famously carries a tattoo on his buttock of Butler’s initials and a table tennis paddle after he lost a marathon match to his housemate.

In terms of recruiting decisions, Castagna must be one of the most fruitful selections. From a second round rookie draft pick (29) he played in three premierships, barely missed a game through injury, kicked nearly a goal a game (127 goals in 134 games), never gave the coaches grief and never did anything to embarrass the club. And two Brownlow votes!

He played more games than any player on Richmond’s list from 2017 to the end of 2021.

That all made Castagna’s decision to retire at the age of 26, just 18 days out from the new season, so surprising.

He has walked away from a solid contract, but the money never motivated him. He walked away because he thought it would be selfish to just go through the motions.

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As he said to people at the club, this was the first pre-season in which he didn’t complete the summer program that the conditioning staff had mapped out for players on their break. He didn’t do it for any reason other than he just didn’t want to. He realised then that he was done.

Castagna has no immediate plans other than to do something more with tattoos and play basketball with his mates.

He leaves list manager Blair Hartley wondering about options to replace him. The Tigers really liked former Cat Quinton Narkle over the summer, and he is a logical choice for the mid-season draft.