Money talks if they pay him he’ll be fine and happy. If they don’t pay him they’ll be fine as they control the entire situation as Howard is under contract for 4 years.
I have no evidence for this, but I'm confident X has other voices in his ear besides his agent. Vets who have been there/done that, for example. His agent is getting advice from other agents. I'm confident his agent has put out feelers with other teams. We can't make this sound like it's X vs Miami in isolation.
Sadly, either those voices are being ignored or the voices he respects aren't giving good advice. Flo has been around. He knows how and when to deal with egos and personalities. I hope he or someone can get X to see the situation. I still say the fact he hasn't been traded is either no team is offering the money he want, or, no team is offering Miami the trade they want, or both.