tbf Martinez's 47 from 38 is a poorer points per game ratio than 36 from 24 by some distance and West Ham's upper ceiling is realistically halfway having not always been in the top division, but that's neither here nor there to the central issue - How do we get better from where we are now and not repeat recent mistakes.
Last seasons transfer window and the whole fiasco of changing the manager was a black comedy classic, you couldn't make it up.
This is only anecdotal and I can't remember the exact parties involved, I think it was Koeman, and maybe the owner and the Director of Football Walsh or something like that but apparently each of the three recognised the need for a creative no.10 player, but each of them wanted a different player for that position. They couldn't agree on which one to get, so in the end they decided on a compromise solution.
By buying all of them.