[Update] Has Akanishi Jin finally joined Twitter?

We all know that there are a sea of fake Akanishi Jin accounts that plague Twitter, but it seems like an account started a couple hours ago has a good chance of being legitimate.
He tweeted BENI and Crystal Kay to start his Twitter career, but they haven’t responded, so that means nothing by itself.  However, Shirota Yu actually took the initiative and welcomed him to Twitter, seemingly confirming the legitimacy of the account.  Furthermore, when he tweeted BoA later on, she responded back, and the pair had a cute exchange of teasing.
What do you guys think?
If there’s an official announcement, we’ll let you know, but for now, this is all the evidence that exists.
Source: Akanishi Jin’s Official Twitter (?), tokyohive