Why is he a boomie if his name is "Ressto"
You link'd 2 fights where his damage will be either gimped by others aoe (Garrosh) or stupid mechanic (Thok interrupt's). For Shamans however, I would recommend him not bothering trying to hurricane the green oozes, ur ele shamman and lock should be able to destroy them. He is effectively losing dps by trying to hurricane adds that might be even spread around. You can see that in the logs, his damage drops to almost non existing when hes trying to astral storm (which is bad in it self) and only hits like 1 or 2 slimes... Also, he let the dots drop at that time...
Also, looks like his opener looks wrong, he was in Lunar, dotted only 1 dog and 1 boss then pop'd CA and then applied all dots? Weird... Should be in solar, pop starfall, pop CA, dot everything, SS procs, when CA is down go to Lunar to get another Starfall... Also, he wasn't being able to keep dots on both bosses all the time, wonder if they are spread and hes out of range? Lastly, he didn't align 2nd pot with his 2nd CA burst, instead he used on hero. I think its okay since he isn't using Inc, but if he switches to INC/DoC he should def be doing the 2nd pot there and not later imo.
PS: on Thok, tell him to try to time better his casts over the boss's interrupt. If you guys push him where you're getting interrupted every second then just tell him to spam his eclipsed dot and use SS procs. It won't be awesome but it will be better than nothing.