Who is holding 20% of all coins? Wouldn't that wallet be probably bittrex?
Definitely not an exchange. If you look on the block explorer you only see transactions going in with very little leaving the wallet.
Its definitely a miner with a ton of hash power thats been mining the coin from the very beginning.
http://www.richlist.eu/litecoindark/stats/LVS7x6bBWFqFbBd8F8d14aPkp6cH3k1HgE