I do not think promotion and relegation to PD is as automatic as it is between other Divisions. The factors at play include the administration and finances of the club in addition to having a playing group that is likely to compete in PD.
The only instance I know of where one Club has two teams in the same Division was North Shore in under 18s a few years ago and I do not think the Sydney AFL wants to replicate that with complications about players moving between teams and the like (though I understand both teams performed well and they secured the Flag).
I would also guess that relegation has similar considerations as the consequence of demotion on sponsors could in some instances create increased downward pressure on performance ... though Balmain look stronger than they were.
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