My bad, should've elaborated. I just meant how he's a lone maverick, when Mando's are more tribal. But anyways, looks like the real answer is more fuzzy: I'll copy and paste one of the interesting answers I found online. Long story short, they were never really meant to be Mandalorians in the first place.
"If Dave Feloni is to be believed, Lucas never intended for the Fetts to be Mandalorians. The idea for the Mandalorians came about during preproduction for Empire, and mentioned in the novelization. The Mandalorians and Boba Fetts relationship to them would be expanded upon in Expanded Universe, however when Lucas began production for Attack of the Clones, and when Feloni was working on The Clone Wars, much of the EU was relegated to Legends, while keeping the broad strokes, and changing the connection the Fetts had to the Mandalorians."
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