Puzzle 49 - A useless clue

[Saroupille]

I'm pretty sure that this puzzle has still a unique solution if the "line clue" 11 (on the left is removed). But probably it is possible de remove another clue to keep the unicity of the solution...

[LTK]

I found that clue useful to determine that the x2 was necessary in that equation, which gives you one more confirmed tile in the group of 13 and makes it easier to narrow down the options that result in a total not exceeding 13. But yeah, it's technically not required.

[Cannoneer]

I've solved this puzzle using this clue, but not using "group of 13 tiles" clue. So 1 extra bit of info in this puzzle, but not necessarily in one specific place.