Seams like I-124 has been used much more often for practical reasons. The half life is a day longer and the chemistry was simpler. Zr-89 has some benfits wrt the emissions.
As to DNA working on this, that is very common. PPHM certainly would still have it's rights, but Roach would also be able to patent the combination. They would have to come to terms if this was found to be of sufficient value to carry forward.