Great detail of an area that few have travelled. That sounds like it was a really beautiful area and still is in a different way.
The 2018 flooding rain in feb really carved up a lot of river beds in burned areas and down stream. The PCT in Whitewater River was completely washed away in areas, the beginning of South Fork Trail was washed out, Fish Creek got very rutted in places and Santa Ana River near 7 Oaks had many fishing pools and now looks like somebody grounded up gravel that lines the riverbed. The flooding/mudslides can also expose new waterfalls and cover existing ones. Over time nature keeps changing but we only get a glimpse of it.
Thanks again for sharing your trip