I think it’d be more likely that Regina would kill Tamara than Greg. Just because the actress is a regular on The Walking Dead.
I was of the same opinion but apparently TWD has already shot their entire 4th season, they do it much earlier in the year. She may be back in Georgia now, though, according to her Twitter the last time I checked but I’m not sure if she was needed for shooting TWD when OUAT was getting off the ground.
Regina’s gloves: Possible people connected to Ariel she could have killed in the past
–Triton (if she’s Ursula this makes total sense)
–The real Ursula
–One of Ariel’s sisters
–Eric (long shot, I know)
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"He was a lot of things to me" "The only conclusion was love"