Let me do my best.
Since the MC gets this extraordinary gift and has to cope with it, I am fairly certain it is MC Situation. He is both concerned with how he is going to offload it (So, Future) and with the many attempts to lure him to give it away (So, Present). [The gift cannot be stolen.]
I believe it is Steadfast/Stop as well. The MC does not want to be embroiled in the Emperor's Court, but that's not really a choice until he gives the gift away. [He's prevented from giving it away willy-nilly for the same reasons you couldn't just offload a nuke to just anyone and then expect no blowback.]
The MC is neither R nor Z.
We can try. It's a fantasy adventure.
The RS seems to be a hired gun (to protect the MC from assassination) who lives by a code of rules. That works with IC Mind.
Neither is the MC.
Z is a newly promoted advisor to the Emperor. R is the most powerful member of the military.
They are (by policy) equally regarded by the Emperor. Neither ranks above the other. This is not explicitly stated until Z screws it all up by driving R out of the capital, which upsets the balance.
But here's the thing. R has no real power. They're playing him the whole time, making him believe he is highly regarded. This is how they prevent rebellion.
But nobody has told R (for obvious reasons) and nobody has told Z either, which is why he screws it up. Because he sees R getting more and more influence. He just doesn't know that it's actually illusory.
So, Z's game is to put R back in his place (as in, not a regarded member of the Court).
And R's game is... well, he was happy until he got pushed out, and then he leads a rebellion because nobody puts him in a corner.