I think that their priority import is Nicholson and they are waiting for him to get better at this stage but it didn't come that way, i mean his injury has worsen or not yet healed as of this time while Powell is more usable than him. Let's not be deceived with this activation of Powell because he is not 100 percent healthy, people might think that it is good to bet now for the Dragons as Powell will be playing but this might be just a mind game for the coach of the Dragons.
Note that once they replace Nicholson, the Dragons can't revert back to him as an import, would be Powell till game 7 if needed.
But nevertheless, it's welcome news for the backers of the Dragons that somehow the Dragons will have an import playing in game 6.