Perhaps my understanding of how the Cheun Jen Sect's 7 Stars Big Dipper Formation is poor, but it seems to me that a Great could smash it with relative ease as long as he doesn't play into the formation's hands. For example, if East Heretic Wong Yerk See were use Jade Flute Sword Technique to duel the seven Taoists, then I can see him getting hemmed in by their formation, but he has skills that make getting up close and personal with them completely unnecessary. All he would need to do is use Divine Finger Snap to quickly take out Gok Dai Tung and Sheun But Yee (none of the Disciples have much of a chance to dodge or block the Divine Finger Snap), or perhaps overwhelm them with one of his inner-power generated flute tunes, and the formation would be useless against him. Ditto with North Beggar Hung 7 Gung: perhaps using the Dog Beating Stick Technique to duel it out with the Taoists in the formation would be playing into their hands, but what would stop him from smashing Gok Dai Tung, Sheun But Yee, or even one of the stronger Taoists with Hong Lung 18 Palms? Again, none of them can reliably dodge or block it.