Thanks! Headcanon for me has his powers restricted by the Council. I mean the man exorcised Eyghon in his 20s - it wasn't wholly successful (he had to kill Randall to do it, but then he had been doing all sorts of magicks with Ethan and the rest and raising demons for a while - a drain on his reserves - and he was probably drunk at the very least and/or high. He reversed the spell Catherine the Great put on her and her daughter in Witch. Then he did the spell with Hansel and Gretl. Those were some pretty powerful magicks he played with. I also believe he was rather hesitant with the magicks after what happened in his youth. I think once he was free of the Council rules (as in when the old Council was blown to smithereens), he was free to play with magick again and since he was older and wiser - and helped Willow through her "addiction" - he grew more confident in his abilities and his use of it.

Clearly I spend a lot of time thinking about this stuff. lol