This is a business decision. But unfortunately, a cu5 worst rating appraisal is a disaster for the lender, it is not lendable because CU thinks you are doing it very wrongly. Sometimes they get another appraisal. And more unfortunately, CU is of no help. I recently got a cu2.6 which was .1% above safe harbour, a problem with the lender. I kinda made an educated guess, slightly changed 1 adjustment line, no affect on value. Bingo, came down to 2.o, whada. I deal with direct lenders where problems can be resolved by talking. I assume just like a value is really a range, and not a price point, that my adjustment are a range actually, with a price point being forced on us. I'm good, but any appraisal can be made to look bad, but you can't make a cu5 look any worse, it's already there.
Into the valley of death rode the cu5 can't change, my price point, adjustment, appraiser. Lenders having more appraisers than needed, i would cross you off the list, even being innocent. The perception of wrong can also get you into trouble. This post is more for the younger appraiser's thought.