I agree, if I had my way Black Panther wouldn't be anywhere near the X-Men, let alone Storm. But Vita clearly has an affinity for writing strong black female characters and Wakanda is home to many of them so it is what it is. The Sword of Bone would've been more interesting but for all we know this could still end up tying into Storm's bloodline. If a god did enchant that weapon, it could've been one of her ancestors. Maybe even that classified woman she's been seen fighting in those covers.