The Dragonborn is relegated to "King Maker" because the character's canonicity has to remain ambiguous (something I'm getting tired of by the way).
Me too. It doesn't create anything interesting from my perspective. I'm just reduced to a guy who traverses the land and clubs everyone over the head. Pew pew pew. I feel like all the interesting political/dialogue/roleplaying/world changing stuff is stripped from me, and others (NPCs) get all the power instead.. It's like being a kid or a woman in Victorian England. "Don't come around here. The grownups are talking."
In that light, I can understand why the Underking is so pissed off and vindictive. I once hated Wulfharth, but I sympathize now. Even further, it makes me think Talos worship should actually be banned. If there's anything to the Arcturian story, then Tiber Septim is a weasel. Wulfharth was probaby doing the equivalent of what the dovahkiin does in Skyrim - lots of quests and stuff haha.. and then Tiber Septim steals his thunder (literally!).