That's an interesting story passed down through successive generations.
Think some aspects don't add up, due mainly to information gaps.
Without even considering the plausibility of falling skeletons from treetops, find it difficult to believe that a Confederate sharpshooter was perched high in a tree in this vicinity of the battlefield, if it relates to the events of July 2.
In the sweltering heat of that day, exhausted and extremely thirsty Alabamians, many of whom did indeed carry Enfields, were in a fast-paced pursuit of rapidly retreating Berdan sharpshooters, up the slopes of Big Round Top. At the time, I believe the terrain they traversed over was difficult. It was thickly timbered with heavy underbrush (as evidenced in the video), and it got more difficult and boulder-strewn, as well as steeper, approaching the summit.
It's difficult to accept that in those circumstances, with these Alabama units in swift pursuit, that a Confederate sharpshooter (likely to be an Alabamian) was positioned in a treetop, with no clear visibility in dense woods of an enemy who was in rapid retreat under the concealment of heavy vegetative cover.
If any skeleton was indeed found afterwards in the treetop (a discovery that would have been hard to misinterpret by any witness), it seems more likely to believe that any such soldier may have been a spotter temporarily assigned to reconnoiter the surrounding area but who got targeted by a hidden Federal marksman operating nearby.
Also thought it hard to believe that if the original finder went to the extra effort to mark the spot and return with a party of people to bury the remains, that they would not have marked out the burial spot and at least one of this burial party would not have known the whereabouts of the interment to recall later.
Think there are some holes in this regurgitated story that may need explanation.