THJ Foot Fracture: What to do?

[ThisIStheYear]

Yes. Don’t think you are considering the alternatives. Maybe you are and just hate the signing that much. 
But not signing him wouldn’t have magically created cap space. It would have made it easier to avoid luxury tax while keeping DFS and JB, which is a good thing. But don’t see how it would’ve helped in any other way.

If the Mavs can’t keep DFS or JB due to luxury tax concerns, the THJ signing is pretty far from the small thing you describe. That would be a huge miscalculation.