In my experience, once a PB has put out a new growth which itself has matured, that first PB won't bloom.
However, that's just what happens here, and orchids this past year seem to have been going a little haywire. If someone has had a different experience, please post!
With that many growths though, you should be getting quite a few new ones from each of the old, and if only those bloom, it should still make one helluva display. Putting the plant in strong light should spark up a ton of spikes for you.