Regina Redeemed (because that's what Rumpel wanted)

why did he take her with him to collect the fairy dust from the mines and block the wishing well? (when Cora was about to come to storybrooke) he didn’t need her there… what he wanted was that she would suck up all that fairy dust FROM the well she had to be convinced by Henry… this is why he never touched Henry, he let Henry talk Regina into sucking up the fairy dust… he did flip Red away from there…

fairy dust is supposedly GOOD, no?

I PROMISE he wanted Regina redeemed. this was probably why he made sure he’d ba able to get her a child to adopt when he loses his memories, he knew that a love for a child is very powerful, and it can bring her back.
when he found out MonsterCora was on her way to SB he knew she will make it there, and he also knew how Regina will fold to her and probably slip… so he got her to go on an adventure with him, “block the well” yeah, right, until Henry succeeds in convincing her that GOOD ALWAYS WNS

maybe that fairy dust was supposed to protect Regina from the evil that Cora was going to make her?

well, anyway, Rumpel was not afraid of Cora at all, and the writers made it very clear… “I only know what you taught me master” and how relieved Gold was when he saw that it was only Cora in his sop.