It's worth pointing out that for this strategy to work, you need to be able to post OD ratings that are *significantly* higher than your opponents' offensive flow rating. The reason heathens and SM have been able to pull this off is that they have/had multiple 20+ OD defenders, and passing has been relatively undervalued among high level players/clubs. I think if the rest of the NBBA started playing multiple 15+ PA guys, you'd see this strategy take a big hit. Problem is, those guys are hard to find, and harder to pay. They exist (and end up on national teams, which is why this strategy hasn't worked very well at the NT level, despite it being pretty easy to start 2 or even 3 20+ OD guys), but they're not yet prevalent enough to over come those massive perimeter defense ratings.
It's hard to put an exact number on it, but my guess is that for this to work consistently and effectively, you need to be able to put up a perimeter defense rating about 1.6-2x what your opponents puts up for flow, while playing m2m.