Oh no. There's nothing to thank Greyjoy for other than continuing to further be a disastrous representation of his kind and making mistakes that benefit us. I'm certain he will only continue that fine tradition here.

[ Because that's the only thing Theon Greyjoy can be dependable in. Being a failure. ]

As for Snow's involvement, it was both indirect and a direct consequence of his foolishness. He was at battle with Ramsay Bolton, knowing of Bolton's reputation -- knowing that playing Bolton's game would only result in the death of his brother. And yet, because of his need to be a hero and do the right thing, he charged forward and left his forces behind at battle. He got his brother killed and nearly ended his own life. He is his father's son, after all.