Maybe I'm mistaken but I think the stove was found in the tent.. but in an unassembled state. This might mean they didn't assemble it yet, but wanted to (there was a log of firewood found next to the tent); or that they used it and disassembled it. Or... that they didn't even want to use it. Why store it in the tent though? I imagine it's very uncomfortable to bump into / step on...
The camping stove filled the tent with smoke. They panicked and left in a blizzard. Period. Anyone who doesn't think so is a conspiracy idiot.
The thing is that it was very cold. And also windy. If there was smoke, it makes sense to leave the tent in a panic, cut it to air it out, also somehow put out the fire in the stove... but it was found in a disassembled position, so that's one inconsistent detail. If the stove produced smoke, it must have been hot, so they couldn't have disassembled it for quite a while.
Another one is that they went all the way to the forest without putting on their coats.. surely the tent would air out in a minute in that wind, enough to grab a few coats?
Also there is no explanation in this course of events of why they would have died. We know tent didn't burn, so why didn't they return to it after a while?