Well, deleting wallets will definitely cause a lot of coins to disappear. Do you know when this happened and for how long was BTCGuild was merge mining iXcoin?
it was in the very early days of ixcoin, before merge mining was added to the coin. btcguild was the biggest ixcoin pool at the time.
I really doubt they just deleted those wallets. At the time ixc was worth quite a bit in BTC so they probably sold those ixCoins out of people's accounts and then deleted the empty accounts.
At least they didn't hold those coins so there's no huge 10% holder to dump on any big rally we may have.