Since his return to the Northern Ireland dugout in 2022, Michael O'Neill has time and time gone back to the theme of the level where his squad play their club football.
To see four of his panel make Premier League debuts over the past 12 months has certainly been a source of encouragement for the manager, while Conor Bradley's top-flight quality was clear throughout.
O'Neill's all-Championship midfield, however, were crucial in exerting control across an especially impressive first half.
With the return of defender Brodie Spencer to the squad after missing out last month through injury, there could have been the temptation to start the Oxford United man down the left flank and allow Crystal Palace's Justin Devenny to feature in his more natural midfield position.
O'Neill opted against the change and was rewarded with Shea Charles, Ali McCann and Galbraith keeping possession and putting their side on the front foot throughout the opening 45 minutes.
While Slovakia clearly missed Napoli's Stanislav Lobotka in the middle of the park, Northern Ireland's superiority there set a real platform, with the link between Galbraith and the brilliant Bradley down the right proving particularly dangerous. It was no surprise when that combination forced the opening goal after 18 minutes.
Such was Northern Ireland's dominance during the first half, Slovakia did not have a single touch in the opposition box, with the only blight of the opening 45 minutes for the hosts being their failure to find a second goal.
There were certainly times during the second period when that looked like it might prove costly, most especially when Strelec was put clean through, but he rolled his effort inches past the post.
Northern Ireland have proven resolute during this seven-game unbeaten streak at Windsor Park and have still conceded just once during the run.
After Hume's 81st-minute effort took the sting from the final minutes, Northern Ireland fans began to chant of winning the group. At the halfway stage of this six-game qualifying group, a first World Cup in 40 years remains the target.