It won't do to build up a fresh character new to the series and play them for 50 hours only to switch to the Divine for the end.
What is the Divine One going to do for 50 hours? Unless he is fighting entire armies, or the time in the Plane of Hypnerotomachia reset his abilities, there is not much that we've seen in Rivellon that would offer much of a fight. Of course, Damian could always unveil his secret weapon, which adds 60 levels to all the bad guys, though Rivellon would need some excellent new defences not to be wiped out by anything that could pose a challenge to the Divine.
I'd be fine with Damian and the Divine being stalemated, with the player character having to do something (like rebuild the Council of Seven) to tip the balance (possibly in either direction).