The hell he was. Boba showed up on his show, and was more John Wick then Din ever was.
Characters don't have plot. The story does. Characters have arcs. Din has sadly been a pretty static character for the most part, outside of my boy Rick's episodes.
When did Din walk both sides of the Mandalorian way?
Yes, Din cares about the Mandalorians. Which is why he knows they need a capable leader. Bo is a vet, with far more leadership skills, combat experience, and understanding of Mandalorian culture then anyone else on this show. Well, outside of maybe the Armorer, but we don't know who she actually is. Are you unaware of who Bo Katan is? She helped take back Mandalore from Maul. She helped retake it from the Empire. What makes her less qualified then Din, who doesn't even know traditional Mando cuisine?