So everyone is talking about how Keith’s dad has an uncanny resemblance to Shiro. When I first watched the episode, I thought it was a younger version of Shiro in the room until Keith said, “Dad?” I think there was a hidden meaning behind the fact that they look almost exactly the same.
First, we already know this season was very Shiro and Keith (broganes) heavy. They showed Keith’s background and gave him a more rounded out character. Shiro was his rock throughout the whole thing, a big brother to him when he needed it. Keith has always showed that he’s super close to Shiro, which was amped up this season and I think they were building up to episode 8 where everything went down.
Keith had already hinted that Shiro had taught him everything he knew, gave him the best advice, and supported him through a lot even before Voltron. They set this whole relationship up as a mentor, teacher, older brother and more importantly, parental guardian situation.