Can somebody explain to me the details of why the Nets can't sign him?
From what I've seen, it's because the Rockets matched their offer sheet (not just exercising right of first refusal, and then refusing, but going beyond that, matching the offer, and then changing their mind. It puts DMo in a really crappy spot that he wouldn't have been in if they had just refused to match after his physical
This seems like something that has to be addressed in the next CBA as it is about the most asinine thing I have ever heard of from a FA standpoint. I am all for the Nets being screwed (at least the next two years, but this is totally unfair.
No, it's pretty reasonable. The rule is in place so that players can't have side deals with teams they negotiate a contract with. For instance "refuse to go to the physical, or fail it on purpose, so that you can come back to us." By restricting him for resigning with that team for a year, it removes incentives of such malfeasance.
The one thing they could, but probably won't, do is make the physical part of the matching terms. In other words, if the Nets are willing to sign him without seeing what's under the hood, the Rockets have to be too. Beyond that, I think everything worked out as it should have.