I will say this, and this is 100% speculating, but, supposedly Creature was intended to be an opening day attraction back in the beginning. It was held off until phase 2 because one of the technologies involved on the ride was going to take a little bit longer in development. IF they have worked out that tech in the time that the park has been delayed, they could jump on this and get it done sooner.
It may have already gone through design processes and be ready to go, but it'll still be dependent on whether materials and ride system manufacturing can be ready in time. Either way, I feel good about this one happening, even if it remains phase 2, because it was so far along already.