Yeesh, I went to bed and you all had a party! (Other side of the globe here...)
I was going to suggest moving quickly to IC anyway, considering Thomas More seems the shoe-in for MC. I think there's only two scenes he doesn't lead us into (Rich / Cromwell's plotting and the wedding party).
We'll definitely get to the Resolve and the Throughlines soon. Your discussions thus far mimic my own back-and-forth thoughts about where things lie in the storyform.
I think we have 'Group' Influence Character - a handful of players who add up to an opposing perspective. I agree with the general consensus above that Henry, Wolsey, and Norfolk are the likeliest members, but I don't think it is necessarily limited to them.
I see the IC as "Henry VIII's Regime." Comprised of Henry, his administrators in the government, and the nobility, they are all concerned about the Tudor dynasty coming to an end. So I think the 'agents of Henry' analogy that @Prish used is accurate.
You can see that while this involves a fair amount of the cast, it does not encompass everyone. Roper, Alice, Margaret, and Rich (even though he gets entangled with court shenanigans) are not concerned about the dynasty. But in the beginning they pester More about "the divorce," thus aligning them with the OS.
This brings us to the Relationship Story, and this is part of my reasoning in seeing the IC as a group perspective. I don't think More's relationship with Alice, Margaret, or Rich changes over the course of the story - but with his political superiors? With the government he once served? Definitely.
I think this is the heart of the story: The State and its Subject. It is a dissolving relationship, where the once most-trusted subject becomes "guilty" of treason.