Jolly Ruby
Privateer
Honestly, I think this dissonance is already reconciled. While I see how the original paladin can be related to crusaders (they are inspired by the fantasy novel Three Hearts and Three Lions, more on that later) I don't think the crusader roots remain in their current incarnation.This thread is about finding ways to rectify/reconcile that dissonance.
Which points I can see being related to the fantasy crusader inherited from THTL: 1. the paladin must be "lawful good", 2. the paladin must have religious connections. 3. the paladin must kill the "evil aligned races".
The three itens aren't present in the current edition, and the paladin is less a "holy warrior" and more a gish with an oath. Even past editions of D&D didn't delve too deep into the crusader image, being mostly self referential. Other games, mostly electronic RPGs from what I've seen, used the crusader archetype heavily, and maybe it's why the relation between crusaders and paladins still lingers in some corners of the internet like Reddit.