That wasn't a display of magical ability on his part. That was him piggybacking off the Red Courts own Ritual.
Again, not a matter of Skill. Harry himself acknowledges that it was just a matter of having the juice to do it.
The White Council fears him because of his Reputation, his Tendency to run with the Bad guys, and his propensity to make monumentally dumb decisions and somehow live past them.
So do I. Mostly because Molly would never expect it. You don't need to be skilled to suckerpunch a young woman that has been pining over you for a decade.
Looks at Mab, Titania, Odin, The Erlking, The Winter Lady, an Army of Fae, Two Knight of the Cross, several Senior Members of the White Council, The Archive, The Queen of the White Court, a Couple Valkyries, a Bigfoot, and a Knight of the Blackened Denarius
Right... "Solo"
Yeah, too bad he never does anything useful with it.
Of these, only Little Chicago is actually a testament to his magical skills, and that was used about twice ever, and only worked because someone else sneaked into his lab to grade his work for him.
Jim said that Harry is one of the best wizards in the world at creating magical objects. He's Senior Council member good at it... So when it comes to making things like his shield bracelet, blasting rod, rings, and Little Chicago, he's doing things most wizards can't. So when it comes to that area of magic, he is world class.
Those things take time, and money to create, and maintain. Harry has been seriously busy for years... Now that he's got a Castle, and said it's time he started practicing again, I expect some cool shit in future books.