Kyatér is using too few Healing Stream Totems.
He should be using High Tide as his lv 100 talent, not Cloudburst Totem.
Still too few healing stream totems, can't stress it enough. (4 totems on a 4+ minute fight)
Echo of the Elements is very situational, Ancestral swiftness for the 5% haste and oh shi- button should be standard, elemental mastery is better on fights like butcher.
Glyph of Riptide is usually amazing (better than the spiritwalker glyph I see), the instant amount is negligible, you mostly use the button to pre-hot or get stacks of tidal waves.
3 Healing rains over a 4+ minute encounter where the entire raid could benefit from it 90% of the time, is way too few.
He has 90 casts over a 252 second long fight, with the vast majority being 1.5s or below, he's either just being too careful with his mana, or being limited by his low spirit (his only spirit is from his necklace).
He didn't use his Shards of Nothing trinket on-use effect even ONCE during the entire raid. Wat. (even the laziest person in the world should at least macro it with Healing Tide Totem) (
https://www.warcraftlogs.com/reports...ss=-3&source=5)
tl;dr I don't have much more time to spend looking over the logs, so I might have missed something, but for starters he should start using the healing legendary ring (spi/haste), change some talents, get some more spirit in general and be more proactive in his healing.