Keep in mind that the 2nd Amended Complaint alleges that Dudden (a non-party), not Snow, put 24 lbs in the zippered pockets of the BC. The complaint alleges that an additional 20 lbs of weight were found in the dry suit pockets after transportation to the crime lab, but I could not find any place that stated how those weights got there. Defendant Snow denies in her answer the allegations of the complaint paragraph indicating that she advised the deceased she could enter the water without the drysuit hose. The 2nd Amended Complaint also explicitly states that "Seth Liston and Nathan Dudden were paired as a buddy team, while Linnea and Bob were not." The answer denies the allegations of that paragraph. Perhaps there is a dispute as to whether they were supposed to be a buddy team and whether the dive was intended to be an instructional dive. I honestly don't know.
Also, there is much discussion of weather in this thread. According to Weather Underground historical data, the temperature at 4:55pm in Kalispell, MT (the closest I could find to Lake McDonald) on November 1, 2020 was about 50F and the weather was fair.
Nothing in this post is intended to be critical -- just to point out that some of factual allegations in the complaint are likely to be disputed and that there is a lot of extrapolation going on in the discussion. Much of the discovery (video, depositions, medical records, etc.) will never be known to the public unless the case goes to trial.