Aladdin and Emma are both saviors, so that makes the most sense to have it be an Emma centric episode along with Aladdin. Also, just recently the writers said they would love to explore more of Neal and Emma’s past in flashbacks. It makes me wonder if Neal and Emma are the ‘street rats’ in question.
I suspect that it will be Aladdin and Jasmine getting the flashbacks for this episode, not Emma. I’m sure there will be parallels with Emma, but those will likely be present day scenes.