for the first you are just paranoid that he doesnt have a username and that he hasnt posted in some time, if you look at his post history, a few years ago, most of his posts were in the german section, although he speaks english now, if you look closely, it is obviously not his first language, he probably received the email today and decided that he will come back
About the first: the account was originally in possession of a German, who started a service that soon turned into (possibly) the second largest ponzi here at bitcointalk. He claimed to have sold the account to another German, who then claimed to have sold to a Russian. Nobody knows if the original account ever changed owners in the first place. But today, the account came back with a very fluent English speaker, potentially with a Dutch origin. Paranoid I may be, but that does not mean that I'm wrong 
