The market makers simply do not show all of the bi

The market makers simply do not show all of the bids and asks that come through them. Remember that there are FOUR primary exchanges for OTC stocks. A crooked market maker (sorry for the redundancy) can just not submit the data for the Level 2 data aggregator, and then wham the trade in when they want it to cross. It's so instantaneous that it never shows up on the Level 2.