I'm sorry but the 3rd airdrop would be the last since devs decided to give out the left over to current holders of the token, which depend on stored amount. (those that have higher # of tokens , will get more and vice versa).
Take the chance now and join possible bounties on current airdrop or support the project by buying to ether delta.
IMO, it's not a bad idea to HODL PoSToken considering it can easily be mined and have good minimal supply.