Why ANOTHER sand behemoth? Tatooine has sarlaccs and krayt dragons AND NOW THE YMIR/KRAKEN?!? The creature design didn’t fit in the SW universe at all, let alone Tatooine!
There is never enough monsters. Tatoiiene is size of a super earth. There are a lots of places and if the sand dragon is one of them, there has to be others to balance the scale, leaving krayt on top. And I disagree, the creature fitted well within the galaxy and it's not even the weirdest creature in the SW universe.