Well.....the obvious that the lender is not convinced. Maybe lacking commentary because again, the lender sent a sale to stick in the report. Also, based on the OP's stubborn stance, they felt they provided enough evidence of market value with sales 1.6, 2, and 3 miles away concentrating on the construction of the subject dwelling as opposed to location. Now, I don't know the OP's area, but over my way, those are different worlds in median prices, schools, etc. Maybe the OP didn't input location adjustments?
I don't think the lender would use Realquest.....but collateral underwriter for sure. Did the underwriter thoroughly analyze CU to match up the subject's characteristics? Heck no....they just saw something similar in GLA, not even considering part of it was basement and that it had a pool and threw it his way. All the more reason to search on his own and go back in time to find something more similar within a half mile.
The OP's analysis did not convey the challenges and convince the lender that his $7k over list opinion of value is solid for them to loan on. That's where the rubber meets the road.