You said you were lamenting this tragic mistake of cutting Bolomboy, and then you explained that the reason it was a mistake is because Snyder is so good at developing potential. Has it not occurred to you that one of the most important steps in developing players is deciding which ones can be developed? Do you think that Snyder said, "I see great potential to develop this guy," and DL said, "Too bad, I'm gunna cut him."
Much more likely that DL, Snyder and others sat down and evaluated where these guys were at the time, where they believed they could get them, what they believed they needed as a team, and then they made their decisions.
TLDR: The reason Bolomboy is not on the team is because pros, including Snyder, decided that keeping him on the team was not the right decision.