He was always gonna be the one to shine. His talent is undeniable and he can navigate through styles easily, and has his own visual/musical identity. Also iirc he was the mastermind behind all the merchandising, visual content, community management, etc...of OF. So on top of being a talented rapper/producer he's a talented organizer and can manage different mediums and aspects of his career. Earl had the most hype but his time away really changed the course of his career and he decided to dwell in the underground. Domo is a good rapper but he doesn't really stand out like that. Syd and The Internet got their thing going on but in a different lane. Frank also doesn't seem to care about being a star. The other guys were niche even during OF's runs.