We would absolutely have to sign an actual striker with a half-decent scoring record. Imagine DCL does his cruciate ligaments next week and we've got rid of Richarlison and Kean.
There's a different approach though.
I said the same - signing nobody is better than garbage - when we signed Tosun and Walcott.
We weren't achieving anything that season, or being relegated but we wasted a fortune on both and time has shown we got 0 back.
In short, don't go spending a fortune on Zaha.