The mid table was in reference to #594 whose club "would have approached the season very differently if we knew there was a chance to go up. Instead we finished mid table.".
As for Wallan & Keysie, considering their placements and Big V needing to reshuffle the Divisions with 2 clubs pulling out to go to NBL1, I can only imagine they didn't apply, or if they did were rejected, and would have been given feedback as to why that was.
I don't know those clubs individually well enough, but as one poster said above, maybe its because they relied too heavily on their imports (I didn't see any of their games). But maybe it was the strength of their program as a whole ? Their venue. If they did apply and were rejected in being promoted, you saying they weren't given a reason why ?