Thanks for reminding me that this had not been answered.
Basically, the owner with the largest unit entitlement has the most votes and they would prevail except in issues that require a special resolution – where the votes must be unanimous – or where they result would be illegal.
For instance, if the majority owner pushed through a decision that benefitted them, at the expense of a minority owner, that could be considered a fraud against the minority. One example would be if the majority owner gave themselves exclusive rights on visitor parking, ot took over common ptoperty to build a deck.
That’s why so many small scheme disputes end up at NCAT, where schemes can be ordered to rescind or enact decisions that are palpably unfair..