Something that I had never really considered in great detail before, having mainly played as Catholic factions....but what is the how is the liklihood of troops joining a passing crusade affected by zeal in an Orthodox province? Is it just the same old "higher zeal means more hopping on board" or is there some form of modifier to reflect the fact that we are talking about a different faith (albeit both nominally christian), or are Ortho provinces unaffected by passing crusades.

I will confess that as the Byz I never noticed (possibly because they were all aimed at me anyway - curse those Catholics from the west!), and I have yet to see a crusade pass through my Serbian empire....