I think we will get SOMETHING on his backstory
There could be a massive exposition dump but I don’t think so. We know quite a bit about the flashbacks of the next three episodes and I’m pretty sure Facilier isn’t in 21 and 22 which only leave this upcoming episode and according to what I’ve seen/heard, it’s solely Regina and Henry focused in the flashback
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"He was a lot of things to me" "The only conclusion was love"