Scott,
We redid all of the bunkers after the Hanse master plan which was a major effort and expense. When we were able ,over the years, to convince the club to remove trees based on the plan we did so. But, that was a major battle until we got our present green super.
As to why we did not use Hanse I don't know for sure.
A few years ago I was on the green cmte. when a long time member suggested we stop our amateur application of the master plan and bring in a consultant. I recommended Forse because I had been with him on his first visit to RG and I was impressed with his reverence for Flynn and his proven work at Flynn courses.
Rightly or wrongly I believe we thought Hanse had moved out of our league. From the time of his plan in 98 until the mid 2000"s his prestige had risen substantially ,and rightly so, based on his own work and restoration efforts.
So we brought in Forse and Nagle each year and did a few things each year, mostly tees.
To the club's credit they decided it was time to restore the bunkers, remove the last offending trees, and recontour the fairways so they decided to update our master plan. They used the wonderful Hanse plan which , in my opinion, was a homage to Flynn and combined that with the original Flynn plans and our aerial photos from the year the course opened and others taken within the first decade.
They superimposed the original design upon the early photos to create a large image for the shaper to use on the bunkers. This was very well done.
They used several of Hanse's ideas that had not been implemented before.