Seems like Denver could be a dark horse in all this. They've got the right mix of roster pieces to make a trade work, they're trying to make the playoffs in a brutal West, and they'd allow Cleveland to get Irving out of conference (which seems like it does matter to teams, like it or not). I could see that resulting team being very interesting.
Kyrie may not want to go to Denver though. Despite the fact that he doesn't have a no-trade clause, agents run the NBA, and I don't see him getting traded to a team he doesn't want to play for.
In this case, he really shouldn't have his cake and eat it too. The agent has no leverage here, there is no contract/extension/option lingering. In fact, the agent doesn't even need to be in the loop. There was a time when players got traded without consent, believe it or not.
What's he really gonna do, hold out? Not report? Go ahead, throw away that guaranteed money, see how long that lasts.
He can't say "I want to leave, but only send me here, here, or there." That's not how this works.