Leave the detective work to the pros.
I did a small sample in which I looked at when Chrono and herobrine posted at very similar times on the, "Banned!" thread.
They posted within 10 seconds of eachother on June 30th.
I found what used to be Xherobrinex's youtube.
I also found his kongregate account:
http://www.kongregate.com/accounts/XherobrinexI cannot find his BL_ID using his name, and I do not have his email address.
They are not the same people.
Unfortunately, I can't find any other accounts of Chrono's (Due to the fact he has a common username and I don't have his email) so there is definitely a reasonable doubt.