I was thinking. You know in TVD and TO how when a witch dies and is turned, they don't have magic anymore. But what if they did. Like what if there magic was just stored up inside of them but blocked off. Take Kol for example. Imagine how strong his magic is since he's been alive for 1000 years and was a witch before he turned.
What if you have to get a siphoner to siphon the block and allow magic to flow. Obviously it would the block would go back after they let go. So that would be a temporary solution.
Think about that.