User blog comment:WreakerOfClash/Who isn't returning to season 6/@comment-24952355-20170803203113/@comment-24952355-20170803214028

We don't know. We Assume he got fired based on his tweets but he didn't exactly explain what happened. If he got fired, there must be a reason for it like spoiling something about the new season. The fact that he probably got fired means that he was in fact involved with the creation of season 6, so Harold's chances of coming back (with probably a new VA) are pretty huge.

And if that really happened to Brian Froud, do you really expect any voice actor saying that yes, they are involved with season 6? Just use simple logics.