I think these categories are too abstract.
We paid £60m and got a player who has slotted in during Havertz's injury absence, and will offer a tactical option or a useful rotation when Havertz is back. He's better than a mere backup such as an Nketiah.
The decision to sign Gyökeres can be rationalised in its greater context, alongside factors like league readiness, "specificity" or other signings. And it has many strengths given that context. For example most people don't say "what about Isak?" partly because we infer Isak would've meant no Eze.