[Autumn]

Daisangan's wording implies that it should be active so long as the summoner has the skill and the youkai contracted, it probably doesn't matter if 2 of the 3 dragon's arent currently considered active, to my knowledge you still have to have at least one of the three dragons active so this sounds like an unintentional interaction with contract tres, but not necessarily a bug. As this would function even if had them as non-active youkai before, such as having 14 youkai when there's only 12 max 'active' slots.

The other stuff I haven't experienced myself but are no doubtless bugs if they should occur.