Highlight Challenge

Here is what I am trying to acheive:

The problem is that Instance ID is not a dimension in the highlight table, and any attempt to put it in there messes up the viz.

I thought maybe I could filter it down with another sheet, and then highlight using that sheet.

This works, but then I cant get that sheet to automatically highlight the "Busiest Teachers" sheet; I have to manually drag click to select all the marks

Thanks!