I think that’s totally valid, RG. S4 is likely it, unless they can get a 13-ep order for S5 in order to wrap up loose ends and hit 100 episodes, which is kind of where I envision something like this falling into place. Like I said, it was just a passing thought, not something I expect is in the works now, but perhaps might pop up again in the future.
4A will be Frozen, apparently, and I sincerely hope A&E know that they better be writing 4B toward a coherent finale.
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Cause this story needs some mending & a better happy ending...