So I'm thinking a good way to say it is....
because there is a difference between creative activity and inevitability in its absence -and a difference between what creativity makes possible which is/was not possible in its absence, the evidence of creativity would exist in what was affected by it -inasmuch as it was different than what was otherwise inevitable and inasmuch as it was indicative of the nature of the creator.
If that which exists around us is complex nature arranged from simple nature, increased knowledge of the simplicity would be more likely to reveal what was necessary at early stages -and more easily than at later stages (provided evidence or logical understanding). Studying that which is already in complex arrangements and already running its complex course would make finding evidence more difficult due to sheer volume of data, and in relation to how drastic a change was implemented at any time.
For example, at this point, if we create a new and very different species from scratch by synthesizing DNA, etc., it would be far more easy to detect (let's say after each change was forgotten and records destroyed -and a significant amount of time had passed) than a small tweak of the DNA of an existing species.
Creativity at early stages of complexity would allow for much afterward, but the amount of data necessary to make a determination at that point would be far less.
Generally..... Creativity may not be necessary for things to continue as they are, but may have been necessary for them to become as they now are.
An automated process which produces simple life forms and then increasingly complex and capable life forms built upon changes made in previous life forms -all of which had the ability to adapt to the environment -not for the continuation of their own life span but for the continuation of life and the process -would not show that INITIAL creativity was taking place -because initial creativity would already have taken place of necessary before initiation. It would itself be AUTOMATED CREATIVITY -as the process creates automatically -as it automatically designs intelligently.
That is in no way evidence against intelligent design in general -as it is such itself -and is certainly not evidence against an initial, self-aware, non-automated, creative designer of the process.
(The process could also be subject afterward to creative activity which adversely affected its optimal function, but that is another tangent)
Therefore, it is not illogical to seek evidence of the non-automated at points before the automation as we know it was initiated ..... Pre-elemental...... Pre-universe..... Etc......
(Random thought ....If everything is the more complex built upon the less complex, logically considering the least complexity possible -which also allows for increased complexity -might effectively allow us to start at a point which at least closely resembles "the beginning" of the present complexity -and help to show what was necessary at any point.)