I have had this idea that your leader has drowned several times and always returns, but often unaware of who they are.
Two PCs in the group washed up on the beach. I was thinking of linking you to Todd, but we already have a bit going on there. Nothing to say he cannot become a member of the order too, but…
What about if you are all searching for your leader, and it is Blair's PC? You heard about him in Dragonfall, found out where he was travelling to from his bard's college and once on Singing Skull Island was not tough to track down.
The fact he has a staff that is solidified water and whispers to him about deeps may be further proof you are after.
He only had a pouch with a paper rose when found, but maybe the 'rose' is in fact a sun coral, the symbol of your order? When you heard from the bard college about this, you knew your long search might be nearing a conclusion. Others of the order are out there searching too.
How does this sound? WOuld you be willing to play as if Lugh (Blair's PC) was your leader? He might not even believe you.