Is part of The Way of Mandolores that they grow by way of taking in orphans??
In the Amory he essentially tithed some of his beskar to “the foundlings” with either him or the Armorer (forgetting which) saying as a mantra “The foundlings are the future. It is The Way.”
His story may be the archetype for Mandolore history instead of separate from it, and why taking on an orphan and making sure it is safe resonates with them. The bit with never taking off their helmets thereby making more cultural sense as the species we are underneath is immaterial - our helmets, our armor, what we haven chosen as our skin, as our faces, is what matters, it is The Way.
Imagine though if you will a Yoda species Mandalorian!! Way!