Yes, I fully agree with you, Simon.
There is a limit available to me to expose the full significance of my terse statement.
As you say, the improvement lies in terms of the ability to cope with the changed environment. In terms of my diagram, I am referring to the massive massive life threatening events following the rise of animals during the Cambrian "explosion".
I feel, and I am open to other views, that this does not mean the "survivors" of each cataclysmic event are therefore an improvement (such as stronger or faster) over the previous iteration.
I guess I am saying that in my opinion, I do not align with the gradualism that featured with the early evolutionists, including Lamarck, Darwin and Wallace, among others. I do not see an "ascent" of Man. I do not see Homo Sapiens necessarily being faster and stronger than other iterations of the homo species.
Doug