So do you know why they changed the look of the Einlanzer?
It doesn't seem extremely hard to model, except with such small texture(128x85), some of the runes on the sword may become unreadable.
Also a weapon model usually has around 90 faces at most, so maybe some complex shapes are not acceptable. The Masamune has 220 faces if I recall, and it is part of Dario's model instead of a standalone weapon.
By the way, from the item menu art, we can see the Einlanzer is not a giant sword like the ones Garai used, otherwise the handle would be too bulky to hold. Perhaps it is meant to be used one-handed, perhaps around the size of the
Atlantean sword.
This is how it looks in Glenn's hand. I didn't model it, it is just a plane with a texture.
It should be even smaller but if so it will look like a short sword. But considering there are plenty of big weapon lovers, I'm not sure if this version is even better.
