It just wasn't as out there as it seemed on NCIS: Los Angeles Season 11 Episode 18.
This case involving the Navy's answer to The X-Files was that rare exception when it made sense to let Eric out of Ops.
Sure, Eric got his own spotlight episode back on NCIS: Los Angeles Season 11 Episode 9. But that was more a case of bringing Eric back into the team after Barrett Foa's sabbatical rather than anything that added to the Beale mythos.
No, a case with a UFO called for a believer within the squad and Eric was the natural choice.
Since the Osp agents were busy chasing down the missing officer, that left the skeptical Dia Agent Raines to fill the role of Scully to Eric's Mulder as they debated the possibility of UFOs, or whatever they're now called. Let's stick with what's simple and works..