The absence is the evidence.

Being a precursor is not inconsistent with great filters, a great filter is why nobody else is there to be one.

Great filter is anywhere at all in the progress of life from pre-life chemistry to stable interplanetary expansion; filters behind us, for example multicellular life or having dry land so we can invent fire, are still potential great filters and they would leave no space ruins to find.

That said, my assumption is lots of little filters that add up. Eleven filters behind us each with 10% pass rates is enough to make us the peak of civilisation in this galaxy; eleven more between us and Kardashev III would make the universe seem empty.