I certainly agree, but I feel Bushi treats that manga as something they never intended to be popular and are just letting keep going until it stops making them money.
They seem awfully reluctant to make cards from that in real life and it didn’t take all that long for stuff like NLK, Exculpate, or Waterfall to be made into cards (even though they all pretty much sucked). My point being that that is what makes me feel that Bushi is just putting it there.
It’s because she’s different and made by a different person, that people like her as a protagonist. And while it wouldn’t make sense for her cards to be made IRL until her clan is made IRL, there are other cards from the story that are from existing clans. They could just make a couple of them promos or whatever like what they did to manga cards back in the day.