Ummm
I think it was pretty clearly stated that Al-Da'wa is neither a single person, nor a group of persons. "He's" a gestalt entity, something that was born from all the combined mind states of all Fedayeen. Al-Da'wa is able to take over certain people and use their bodies for a time.
Alpha One, if he is still alive, is rapidly approaching 80. While medicine has made it so that that age does not preclude being more active than today (Calder being a prime example of this), I can state with certainty that Alpha One has so far not made an on-screen appearance.