The ongoing mind-control storyline reaches a major confrontation as multiple characters connected to the Snake Eyes identity are simultaneously in danger. Dawn Moreno is loose inside the Pit while struggling against her implanted programming, while Sean Collins creates another crisis elsewhere.
The original Snake Eyes ultimately confronts Dawn, using his Arashikage abilities in an attempt to destroy the implant controlling her. Meanwhile, Helix and Beach Head contend with Sean and an increasingly chaotic Cobra situation. The official solicitation sums up the issue perfectly: “Snake-Eyes vs. Snake-Eyes!”
I wouldn't advertise #331 as a major first-appearance key. Its more interesting story significance comes from the Snake Eyes/Dawn Moreno/Sean Collins mind-control storyline and the convergence of multiple characters carrying the Snake Eyes legacy.
For this particular listing, the variant itself is the bigger collector attraction: a complete Jordan Noir A/B connecting Virgin set limited to 750 sets. Having both books together is important because the artwork was specifically composed to create one continuous image.
This is a particularly effective connecting-cover concept. Snake Eyes occupies the entire left book while Dawn Moreno occupies the right, with their bodies meeting almost perfectly along the center seam. Their matching black ninja gear visually reinforces Dawn's connection to the Snake Eyes legacy.
Jordan Noir contrasts the dark costumes with an extremely bright hot-pink and purple G.I. Joe patterned background, giving the pair considerably more shelf presence than a conventional military-themed G.I. Joe cover.
The Virgin format is also ideal here: there's no title or trade dress interrupting the connection between the two pieces of artwork. For collectors of Snake Eyes, Dawn Moreno, connecting covers or retailer exclusives, the complete LTD 750 AB set is substantially more desirable than separating the two books.