Have you seen the morphing sequence for Power Rangers Lost Galaxy? Where they make the black zig-zag stripe on the suits look like the black inside of a mouth as the jaws come together? What they're trying to get at is whether the Zyuranger suits were meant to suggest something similar or whether it's just a diamond pattern. Personally I always just figured it was diamonds and it was later fan drawings (possibly influenced by PRLG) that tried to make the jaws connection.