That's right ghosting or 2 way ghosting is nothing else just a zerocoin protocol implementation allowing using already minted coins mint again(creating such a second layer to hide tx) before you will spend them. Every spend tx creating tx with size of 25 kb, he don't have optimization to reduce size of zerocoin spend tx - sigma or bulletproof arithmetical circuit.

I don't see reason. purpose to use 2 way zerocoin function waiting 18-20 block to do one secret transaction.

Ghost node is nothing else just the stealth function covering your real wallet address on your masternode. for example real address 1z511d4d5df4f5d4d5 will be stealth by address T55d4f52s1d5d4 that no one know who's address it is.

Ghost is just a marketing name i think nothing else. He came as the ghost took all money and disappeared or it was leprechaun that is filling his gold pocket from investors money?