Not really. Besides the awkward use of the term crusader there (historical crusaders were...not as constrained by a code of conduct as the class paladin), warpriests and inquisitors really can lay down the smack as well as a paladin. Possibly better in the case of the Molthuni arsenal chaplain warpriest, or if you have good rolled stats the champion of the faith warpriest likewise.
. Historical paladins (or the people who gained that name later, the companions of Charlemagne anyway) weren’t restrained either, and any name for holy warrior has baggage. While they can dpr really well, they feel different, a paladin ‘feels’ blessed or chosen, inquisitors and war priests ‘feel’ trained, like clerics who went to the gym more than usual, I don’t really know how to explain it, but the blessed warrior itch isn’t scratched by inqs or wp (fun classes but fundamentally not chosen)