OK, I've been curious about this for a while. Why does the GAI exclude both WMI and PSI? Are they frequently similar scores?

I'm asking because DDs WMI was high (as were VCI and PRI) and her PSI the lower score. To the degree that our report include both a GAI as well as a GAI + WMI calculation.

This isn't a practical question for us (it certainly won't change anything we've been doing) but just a matter of curiosity.