Board Thread:Spoilers!/@comment-26225812-20150618081046/@comment-1894786-20150707192340

You can be born with magic and you can also learn it. He had 300 years to learn everything he could about magic after having received it. I highly doubt taking out the Darkness took away all of his magic, so that "power vs. love" struggle is still very much real. Also, Regina showed when she made Charming's Sleeping Potion that magic is very much like chemistry or science. So Rumple can still make potions and stuff because he still has that knowledge.

And I also doubt that taking out the Darkness will revert Rumple back to a good man, because he was never a good man. Before he was the Dark One, he killed Zoso in cold blood just because the guy mocked him.