Would be nice if the divine beast we summoned is actually a wyvern and not a recolored Shenrong.
:)
Traditionally , Chinese dragons (the type that Shenlong is styled after, it's in the name after all) don't have legs or even wings. They tend to have serpentine bodies and if they do have limbs at all, they are small.
In that context, this fits the idea of a Chinese Wyvern, so that's where the naming comes from. Well, there's also another reason - but I'll reserve that for future updates.