I don't think they did, however, he's a freaking space wizard who murdered a bunch of children being taught by their brother.
In case you forgot, Leia charged Han with 'bringing their son back', and he tried. Ben murdered his own father. He considered murdering his own mother. By those actions, I think it's reasonable to suggest that they gave it their all before 'seeing the Vader in him'.
This isn't supposed to be a continuation of the OT character's story - they're supposed to usher in the new ones. Focusing on the OGs' stories doesn't make much sense. It's about Ben and Rey. Since Snoke was killed off, JJ had to dumpster dive for the Emperor. I take it he had a plan for a very powerful Sith character and RJ ruined that.