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IIRC Quickseller sold his account. I think it was Legendary. I saw a post of his saying about this. Will post the link if I find it.
Was it a "Trusted" account? Do you remember the nick?

I don't think so. Nope, I don't.
Just to clarify: Quickseller is now his main account. The account in question was the one he (probably) used earlier(his first account maybe). AFAIK he is now using Quickseller as his main. I guess it is because Quickseller is more trusted than his first account.
tl;dr: Quickseller is most probably the main.