I came away after looking at that testimony that many shots were fired from outside, in the front yard, into the residence. Some of the front of the trailer bullet holes lined up with exit holes in the back wall. He also said there were shots from the bedroom, had exit holes through bedroom wall, into the living and even possible traveling out the back wall. There was a cartridge found in bedroom.
We know from JW's proffer, via AC opening statement, that JW was down under a truck firing a rifle into the house from the front. We know that BW came out of the trailer in a very upset state saying he'd killed his best friend. So there were shots fired inside the trailer by BW, IMO.
I think all this ballistic info could have been explained with a bit more certainty as far as the relationship to bullet hole trajectory, blood DNA, victim was hit by this trajectory and bleed in these spots. Maybe I'm just getting ahead of the pace they want/need to set and it will all be laid out after the coroner's testimony is completed for CRSR and GR by a diagram.
Right now, I can't stomach the mayhem that occured in that trailer once the shooting started. While JW was shooting from under that truck in front yard was BW standing at the front door shooting in too? I do believe that bullet fired straight down into the floor by the chair was most likely one of the bullets fired into GR and probably fired by BW.
AJMO