The power forward, who will also back up Alex Pledger in the five-spot, made a number of athletic plays at both ends of the floor, but it is on offence where he looks set to provide an upgrade over Will Hudson.
His 11 points were largely accrued close to the rim, while Johnson finished the game with 10 points and five assists.
But perhaps the best American on the court was the Leopards' Donte Greene and, after top-scoring in all three games, the Breakers will be glad to see the back of the former NBA forward.
The home side started slowly, missing their first eight field goal attempts, but still managed take a 23-16 lead into quarter-time after back-to-back triples from CJ Bruton just before the break.
Greene was a constant threat on the offensive end and he kept Dongguan in the game as the Breakers threatened to streak away in the second period. His 16 points featured physicality from close to the rim and flair from outside, but he couldn't prevent the home side from leading 51-40 at the half.
The third quarter saw the Breakers begin to negate Greene's impact and, perhaps unsurprisingly, their advantage grew to 15 points heading into the final 10 minutes. Reuben Te Rangi impressed off the bench for the Breakers in the period, with the 18-year-old illustrating his explosiveness when driving to the hoop.
Despite his dominance, Dongguan actually made their best run when Greene was on the bench, perhaps indicative of his bedding into a new system. The visitors pulled within four in the final quarter but that was as close as they got as the Breakers closed it out.
Breakers 86 (Vukona 12, Abercrombie 11, Bruton 11)
Leopards 80 (Greene 20, Gu 17, Meng 10)
HT: 51-40