Last of the Gospels, John, and What Can We Say?

Like the synoptic gospels, john does not refer to the fall of or the destruction of the temple in a d 70 as past events. It's harder to make a case from this that john was written before 70 because it does not contain a straightforward prediction of the temple's destruction. But there is a verse which does imply a pre 70 date in john chapter five where John says 'now there is in jerusalem, by the sheep gate, a pool'