They only arrested Reuvers, but the others, at least three big players, are still free. Martien became too high profile with all that violence and keeping all those pills and weapons nearby wasn't really smart either. They are suspected of being involved in the transport of one hundred kilos of MDMA, Martien would also have imported more than 1500 kilos of cocaine and once more than 300 kilos of cocaine.
He was a suspect in various major cases in recent years, but in most cases he was acquitted. Or he got away with a light punishment. Or cases were not prosecuted because the chance of a conviction was too small.