I believe that MrCoins is an alias of Josh Garza or his brother. Their writing styles are very similiar.
One of the few "facts" I know about this whole deal is that MrCoins is not in fact connected and especially not related to Mr Ganza.
Those of us that were involved with Blackcoin in any meaningful way know MrCoins very well and his support capabilities when he believes in what he is putting his money into.
We are pretty sure Mr Coins sold his twitter account to Garza. I can attest Mr Coins was a 'real' person in the Blackcoin chat days as well.