So, there’s the legal issue, as you correctly state, and the “cohesion” issue which is outside the legal parameters (I think?).
In terms of the law, as a layman, it seems to me the matter is settled and there is no legal basis to bar them from making a living.
On the other hand, there is the Mitchell Miller situation in Boston where some of the senior players rebelled against his contract. So, that’s a question, I think, of “good fit”. That’s not a legal question, but rather a question of judgement. (Is that correct? There are provisions in employment contracts that pertain to these kinds of situations, but the ink was barely dry and it seems like a weird situation in terms of sequence.)
So, this will be a case by case situation, largely based on a question of judgement. Some of these guys might come back, some might not.
Edit: I see that Miller was found delinquent in a juvenile court for his actions. So in terms of “legalities”, he had already crossed a threshold that the London 6 has not.