Saki is good on King of the Dead G because of two long lines of pumpkins overlapping with the top-right ranged spot and your lightning rod against the lich king.

As usual, lolix has no concept of what the word "useless" means. Just because you need more upkeep on her doesn't mean she can't be useful. "Wasteful" would be a more legitimate term, but there are worse things to waste resources on. Like Azami.

Hina would be worth leveling regardless, though.