The issue is bigger than a striker, Cunha is a start but we need more players who are capable of breaking lines, progressing play at speed and who are decisive in the final 3rd (with end product).
Sticking Delap, Osimhen, Gyokeres, David etc. into this current set up will result in a few more goals, maybe a bit of a bounce but we will ultimately just have more strikers who are not scoring, not that I am advocating not signing a striker for one second, but Hojlund playing in the right set up would be scoring, maybe not as many as we would want but we would be mad to ignore the problem and stick a brand new shiny plaster over it.
For me I prefer Delap, I am not convinced that a player with the profile of Osimhen is right for us in this moment, and I think missing out on Delap would be something we would live to regret, would love to see somebody else coming in, David seems ideal but don't think he is too hot on the idea from what I read, unfortunately doesn't seem like there are many players like Cavani etc. who we could get in for 1-2 seasons to bring through Hojlund, Delap, Obi and Zirkzee.