The 3357 witnesses at the ground know Neesham's performance held weight, especially considering he wasn't part of the squad for the first test and wouldn't have played had Doug Bracewell not misbehaved or the pitch ruled out the benefits to using leg-spinner Ish Sodhi.
Neesham deserved his accolades, having been padded up for 123 overs while McCullum and BJ Watling embarked on their world record partnership of 352 for the sixth wicket as part of New Zealand's highest test total of 680 for eight.
"When I got out there with Baz I said I'd spent longer waiting in pads than batting in them this season."
He impressed from arrival, launching into strokes all around the wicket building the lead from 200 to the eventual 434. Rumours of him being a bowling all-rounder have been greatly exaggerated.
"It was a bit surreal, especially having Baz at the other end chasing a momentous milestone, but that took the focus off me. The main objective was getting him to 300 then suddenly I wasn't far away from a century myself. "A hundred on test debut is something I've thought of more than any other thing in life to this point."
Neesham said the crowd played a pivotal role and he knew his place in proceedings.
"Baz played and missed at one, then blocked the next ball which resulted in the biggest applause of the morning [until the 300]. To be in a situation where the focus is not all on you eased the pressure.
"We didn't talk about who'd get there first too much but I'm pleased I ended up as the entree to Baz's main course. The crowd had a practice session of standing up and clapping."
Neesham says he learned from New Zealand's first innings of 192.
"You figure out what you're made of in that situation. To get through to 33 was okay but to get out with a lack of conviction was disappointing. Still, it reaffirmed I was good enough to get runs at that level."
McCullum said: "For Neesh in his first test - and with the match evenly poised - to come out and play his natural, aggressive game takes courage."
His performance was also noted by Indian skipper Mahendra Singh Dhoni. "It's good to have players like Neesham ... who can bowl a bit and bat at the same time."