I have not looked at the links, but aren't there people who use Bode plots to estimate direction-of-causality, given time-series data? IIRC there are basic rela

I have not looked at the links, but aren't there people who use Bode plots to estimate direction-of-causality, given time-series data? IIRC there are basic relationships between wide-frequency phase behavior and, e.g., impulse-response functions. There is apparent phase information beyond correlation and ANOVA.