The two he missed were due to being with the 2019 New Zealand Heartland XV to play the Samoa World Cup squad at Eden Park, and then the last match of the Covid-altered 2020 season due to the wedding of teammate Angus Middleton.
A very talented group of men in Josh Edwards, Willie Short, Kane Tamou, Tom Stewart, Josh Fifita, Cameron Davies and Tyler Rogers-Holden got to wear the coveted No 9 at least once, but Horrocks was still always there on the bench to swiftly regain his spot - never once suffering a game-missing injury.
“Just staying out of the contact stuff, eh,” Horrocks laughed at fulltime on Saturday.
“It’s been a bit of a dream run, to be fair, without any injuries.”
Having won three Meads Cups and two Lochore Cups, Horrocks’ competitive drive to bring his union further success remains undiminished.
“Definitely. When you put that jersey on you seem to grow another leg, and the boys are starting to put some things together in the last few weeks.
“Just looking forward to next week and stamping our mark.”
Horrocks also played eight games for the New Zealand Heartland XV from 2015-21, while being named the 2015 New Zealand Heartland player of the year.
Including Saturday, he has scored 25 tries for Whanganui worth 127 points (two of his tries were six-pointers under the experimental rules in the 2016 season).
But when asked to name his favourite accolade or game, Horrocks preferred to acknowledge those who helped in his journey.
“There’s been a few of them [moments], mate, but really nothing too outstanding.
“It’s mainly the people I meet along the way - that’s the big one for me.
“I’ve been lucky with Burgs and Softy [coaches Jason Hamlin and Jason Caskey] for most of the time - they were really good, down-to-earth people that make you want to play.
“They get you up when we might not be the best skill-set team or the biggest team, but you actually want to get up and get off the ground, and that comes along with those coaches.”
With 76 appearances himself, Whanganui captain Dane Whale has been on the end of a lot of those long Horrocks passes, and paid tribute to his playmaking partner.
“It’s an honour to play outside of him in any game, so for him to play in his 100th today, a huge honour to play outside him,” Whale said.
“Massively proud of him, he’s a competitive man and I’ve played against him [in club rugby] plenty of times, but you love having him in your team, that’s for sure. He’s a great man.”
Horrocks jogged out alone on Saturday through a guard of honour from his Border rugby club ahead of his team mates, and then at the after-match function, was joined by his wife and two daughters to accept his blazer with “100″ embroidered on it, and a special commemorative jersey.
