Here's the incident report drawn up by the Glynn County PD.
https://int.nyt.com/data/documenthelper/6915-arbery-shooting/b52fa09cdc974b970b79/optimized/full.pdf
There are a few things that stand out for me. Firstly, is that GM states his home address is 200 River Ridge Rd about 10.5 miles and a 15 minute drive to Satilla Drive.
Second is that there are incidents linked to this crime, two Trespassing incidences that occurred on Feb 24, the day after AA died and an Auto Theft incident that occurred on Mar 4.
Third, is that the explanation that GM gives doesn't jibe with William Bryan's statement regarding the incident.
And forth, their offered times lines of seeing AA on the street, 'recognizing' him as the guy in the video, running into their house to get their weapons (in case he was armed), go back outside, get in the truck, drive to the intersection of Holmes and Satilla, see AA on Burford, drive down Burford to cut him off, then when AA turns to go back the way he came, the turn the truck around and go after him again as AA retraces his steps. That's when he says Roddy tried to block AA.
When I see the video, both Roddy's truck and the MM truck are facing the same direction.
Between the time AA left the construction site and the the first cop car arriving to scene about 6 minutes elapsed. I can't see all that happening in 6 minutes. A white truck that appears to be in front of the TM residence leaves about a minute after AA leaves the construction site.