First, as I have pointed out, a lot of the evidence points to something voluntary. Both suicide and walkaway
are voluntary, so they would have some similar characteristics.
Second, about 100,000 adults disappear each year.
2018 NCIC Missing Person and Unidentified Person Statistics | Federal Bureau of Investigation Less than 50,000 commit suicide, though they tend to be under reported.
https://www.fbi.gov/file-repository/2018-ncic-missing-person-and-unidentified-person-statistics.pdf/view
It would be difficult for RFG to plan some method too hide his body. First, it is generally difficult to hide successfully after dying, though it is possible. Second, RFG did not know what Lewisburg looked like on that day. Assume that he was going to get into a dumpster (as was suggested in another case). Would the dumpster be exactly where he thought it would be, had it just been emptied, would someone see getting into it. Third, the searching was extensive. Why wouldn't someone check the dumpster, why wouldn't the body be spotted from the air, and why wouldn't the bloodhound find it?
It would have to be random.