The key part of this spoiler is it’s a “co-lead”. Once is an ensemble show, there are no co-leads. That points to a show with two main characters…Castle, Bones, Sleepy Hollow, Blacklist, etc.
If I were to lay money on it, I’d bet it’s Castle. She held back on signing on for another season and a lot of spoilers and blind items usually end up being Castle. They love covering that show. If it’s not Castle then it’s Bones. David Boreanaz has had some issues in the past and maybe he’s taking time off.
Whoever it is, this blind item does not refer to Once. I’m positive.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.