User blog comment:Paul.rea/Teen Wolf News 031715/@comment-84.23.60.68-20150318064609/@comment-11533671-20150318145429

@Fuerte92 - "Liam wasn't a series regular in the 4th season, since he wasn't in the opening. This is an entirely inaccurate statement. I understand the inclination to state that characters in the opening are regulars but the exclusion or inclusion of any character from the opening doesn't empirically define such a thing.

Liam could have been contractually signed as a regular and left off the opening in order to keep us wondering whether or not his character would survive. It would have given away plot points, or in the least, would have given us no need to "worry" for his character's survival had we saw him in the opening.