I think there are two reasons: Using Waterfall instead of Horn Attack leads to the same result
Blue eyes is cheap but only good against poor people
Official programs and account posts have shown a meaningful subset of leaders, Super Rares, Loki OP17-119 as a Secret Rare, four Manga treatments, a Super Leader Parallel Luffy, New Emperor SP treatments, and Haki-style SP treatments
If you were a late adopter of Pokmon TCG Pocket, you may have missed out on some of the Promo cards from the early events and Premium Passes
A few fans think that "Unwavering Bond" might've happened in between these two forms, but it failed and left him trapped in the "Unending Nightmare," however most fans tend to believe the happier ending is the real one