And, it's official:
https://www.hollywoodreporter.com/heat-vision/black-panther-2-ryan-coogler-write-direct-sequel-1151626?utm_source=twitter
Eh might as well do this.
The thing with your argument is that, like you said, it's starting at such a high range. The closest solo movie's OW to BP's OW is Captain Marvel, and that's about a 50M difference. And that's even when you adjust the numbers.
And yeah, most solo movies either came out when the MCU was just starting or before IW/Endgame substantially grew the fanbase, but BP still did leaps and bounds above the other movies that it just makes the ceiling that muc