About the Ludwig = Cleric Beast thing. Hmm, I'm not entirely convinced.
Noticing the beast comes down from the Cathedral Ward was very cool, as well as making the natural conclusion that Ludwig was the hunter chief, but the timeline wouldn't fit, right?
Many things in the game implies it's been generations since the hunts first started, and Ludwig was the first Healing Church hunter, according to his Holy Blade.
There are many things that hint at this happening for generations, like, for example, the Byrgenwerth keepers indicated by Willem, that are both dead and bones now, Micolash (assuming we interact with Micolash to enter the Nightmare of Mensis) being nothing more than a mummy, Laurence (assuming he's the skull) being long gone, Gehrman's apprentice being just an old bone, and, I guess more importantly, Henryk and Gascoigne's partnership, which is already a thing of the past, being cited as the cause for Henryk's tragically long life. I don't think Gascoigne was a really high ranked member of the Healing Church, and if he hunted for many years before dropping off and raising his family, it's hard to believe Ludwig would still be alive. The Cleric Beast is most definitely the Hunter Chief, but after Ludwig's passing, a new Hunter Chief would be chosen, it's logical.
If only the Cleric Beast's drop also got you the Ludwig's Holy Blade... But as it is, I feel like Ludwig is more likely to be the Old Hunter Bone than the Cleric Beast. He is the first healing church hunter, but we know for a fact that Gehrman is actually the first hunter, so, in other words, came before the healing church hunters. He knows Laurence, if we're assuming Laurence founded the Healing Church, it would make sense that he would train Ludwig, who then became the first Healing Church hunter.
But the most likely explanation is a Ludwig of the First Hunt DLC