Your entire argument hinges on Gellius + another unit doing Nadia's job. I gave you the math for the cost.

If you want to complicate this by saying Gellius + Solano + Nanaly + Aisha + Katie + Iris + random iron soldier #52 > Nadia, then I won't argue that. But if you're trying to prove that Gellius is the better unit that way, then fucking lol.