Liveman Drama in Gokaiger
Barizorg appears in flashback to be a friend of Joe in the past. They were once comrades who became enemies. Liveman had that too. Yuusuke, Joh and Megumi also lost their friends who became members of Volt. Like Mazenda, Barizorg became a cyborg too except in Barizorg's case - he was forcibly turned into one. The episode also focused on a plot to turn people into cyborgs. Cliche but powerful.
Joe because of his friend Sid having turned into Barizorg is forced but to fight a former comrade. That's what Liveman was exactly rooted upon friends why are we now enemies after some time? I just think it was appropriate to put Joe Gibken as a blue ranger for that purpose. Megumi Misaki as a blue ranger had a lot of blues to deal with. Blue rangers get blue, get it? As to say it, very good Sentai soap material.
It's nice to see Joh Ohara but... I wish he had Yuusuke Amamiya and Megumi Misaki with him. Oh well... his part was written well so that makes up for disappointments that the two are not in the series. Liveman was probably the darkest Sentai in the 80s which has made me reconsider my opinion of the series.