> it makes little sense for Igor, Zina and Rustem to climb back up the slope in a weakened state if they knew the tent was inaccessible from tons of frozen snow on top of it.

That's a speculative statement. "it makes little sense" as an argument is weak on its own, but is 10x weaker when it's based on supposition you just invented regarding the state of their tent and their somehow knowing that state well.