Semyon was certainly the man of mystery on this hike, this older guy with vast winter outdoor experience via his war years paying to join a hike led by the 'kid' Dyatlov. And he had burnt his bridges to do so, quitting his job, which might either suggest new mission, or murder-suicide.
I've always wondered how, as a mere civilian, he even got to hear about this hike. He worked some distance away, and unless there was a system of regional student Gazette or educational institute noticeboards advertising placements it's curious how he ever found out about it.
That doesn't sound right to me. According to his entry in the main site's Who is who, he may have been fired from his job by the start of the Dyatlov expedition. It also sounds like he might possibly have been on 3 months' unpaid leave from his job. Supposedly, the reason he decided to hike with Dyatlov's crew (instead of with Sogrin's, which was his original plan) was that Dyatlov's trek would be shorter, and he wanted time to visit his mother before he had to return to work.
I don't recall ever hearing/reading that Zolotaryov had paid money to join Dyatlov's trek. I think he requested a favor from the local Party committee, and as a Party member in good standing, got it.
The Who is who says that in early 1959, Zolotaryov was living temporarily with Sogrin in the latter's Sverdlovsk apartment. According to Rakitin, Zolotaryov first became acquainted with Dyatlov and Kolevatov at a New Year's Eve celebration in Sverdlovsk, on Dec-31-58 / Jan-1-59.
Obviously, I'm not citing a source for every assertion I make in this post. I acknowledge that it's possible that I'm confused, or have come to believe some misinformation. I'll try to do some fact-checking later on.
The detailed theory
Zolotaryov's Meltdown states that he'd been a school teacher for 4 years until he quit in the summer of 1958, because he wasn't granted leave-of-absence in the middle of the school year to go on a hike. The theory states
"Semyon is looking for a job closer to Sverdlovsk and in mid-December gets a job as an instructor at the Kourovskaya tour base." , so he can only have been there a matter of weeks before he joined the Dyatlov hike after transferring. I can't imagine that his employer would be entirely happy with him going on leave so soon after he started, but maybe they were.
I tried to wade through that long unformatted entry in Who's Who, which is lifted from the book, but it mentions how Semyon having quit his school teaching job to join a hike, and then, as you have alluded, says of the skiing instructor role that
"Unconfirmed reports indicate that by the beginning of the Dyatlov group hike, he had been sacked from the Kourovskaya camp site because he had had an argument with the director." When he joins the Dyatlov group he introduces himself as a skiing instructor, it gets a mention in a diary, but had he been sacked I can understand his pride seeing him pretend he was still employed.
Much of what is written in his Who's Who entry seems couched with
perhaps... conceivably... unconfirmed reports suggest.., indicating the information isn't 100% reliable, even vague, and some of it contradicts itself, for example it says he left his school job in the summer of 1958 but also states he was on a school trip that summer.
I can't find where I read of Semyon paying to join the hike, but I had read somewhere on my travels that the 5 students were paid for by the UPI, the 3 post-graduates by the Union, and Semyon paid himself. This was to be his vocational qualification, not an adventure, and having quit his long-term job and (dates excepting) possibly signed up to Sogrin's hike during a period of unemployment, I think it possible he had to pay out of his own funds.
They all seemed to have to contribute
something, the total costs of the hike didn't seem to match the funding being provided, and out of this would-be 10th hiker Slavic Bienko got a refund of 350 rubles.
https://dyatlovpass.com/case-files-volume-2-61?rbid=19667