Robin knows how Marian died, so I’m sure that if that’s Marian, it’s something that’s been altered by Emma and Hook going back, because he wouldn’t have fallen for Regina if she killed his wife.
The only time we’ve seen Marian before is when she was peegnant, but Robin said she died doing a job. What she was wearing while pregant weren’t her “work” clothes.
The fact that the actress for Marian tweeted about working with a bag over her head is pretty good evidence that that’s Marian on the stake.
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