1. represents the total of all possible proteins that could be coded for in DNA.
2. represents all possible proteins with a selectable function.
3. represents all actually existing functional proteins.
4. represents proteins essential for the simplest living membrane bound organism.
IDers tend to think that the huge size of 1 and the comparatively tiny size of 2,3 and 4 points clearly to some other solution to random testing of possibles until we get the working examples that are needed.
IDers tend to think that even our present knowledge of genomes indicates the need for some other mechanism than random testing to find the necessary tiny needles in this vast haystack. Do the genomes we know look like efficient testing machines to find rare useful proteins?
IDers tend to think that the little orange circle is too big to allow chance to be a realistic explanation for the origin of life. Chance is just the wrong sort of explanation for what we see. It is a little like thinking that random selection of notes in sequence can produce a great symphony.
With objects like the rotary motor function of the flagellum the contraints upon so many proteins at once for selectable function tends to breed scepticism that this object can occur without a designer. This problem is compounded many fold whenever we then begin to think about the origin of life. If it is a real snag that we are struggling to deal with in the flagellum then it is infinitely worse for the origin of life. To reject other explanations outright says more about the rules we impose on our bank of possible explanations than about the real origins of the objects we are examining.