User blog comment:J Fan/Dead Men Tell No Tales - Details: Story, Characters and Setting/@comment-25267670-20150409004610/@comment-1984959-20150409162648

I agreed with Uskok. As I said in comments below, we tend to not use IMDB as a source unless if absolutely necessary...and it's sadly not the case here (with no legitimate proof yet). Plus if one had to choose between IMDB or official announcements from Disney and/or film crew, it may be more safer to follow the latter until late 2016-early 2017, at the earliest.

That being said, of the names listed, only 2 are (un)officially official: Martin Klebba and Adam Brown. Klebba had been teasing his return from many Twitter and Facebook posts, and more recently current photos from the set (and maybe more posts) confirm his return. While "Jib" is unconfirmed, Brown confirmed his involvement in the film via Twitter. The name Danny Kirrane appeared in this report that also had Brown's name, but it seems Delroy Atkinson was not. Hence the hesitation of using IMDB, given the latter's name not being listed.