Having the coil-overs mounted as close to the wheel as possible is always a good thing for wheeling, unless you dont mind the bad characteristics.. The only reason i would see the person with the black jeep running at such an angle is that they bought the wrong coil-overs. "aka" wrong travel length, wrong spring rate and dident want to buy the right springs, or that they were in the budget so he could run 4-link and have true coil-overs.
On the upside to having them mounted like the black jeep. If you driving 50 miles and flexing really good alllllll the time, it wont put as much heat or wear and tear on the shocks themselves. Lots of factors to consider. Hence why manufactures mount rear shocks on a angle rather than straight up and down. Gotta love suspension builds!