I need to explain about this. I do that "trick" only in the instance where a merge gets stuck in a cycle of #2 "must" merge into...#1" followed y #1 "must" merge into...#2. Going back only repeats the cycle, so that no merge can be made at all as both pages insist you merge into the other. In that instance, when I am caught in a loop that has no end, I will change spelling of a profile I manage so that it is redireced into another group. That seems to unstick the merge, and I can proceed without difficulty. I do not recommend randomly redirecting profiles. I do this only when I cannot break out of a continuous circle.
As to the LNAB, if you see two spouses or two children that are duplicates in a profile, searching for the LNAB is problematic in the early years, before about 1700, because spellings variants are the rule. Until the search engine is improved, trying to find the LNAB through a series of spelling changes can lead nowhere. If there were a way to show the lolowest existing LNAB in the list of names, that would be helpful. Frequent examples are found in Scottish, Welsh and Scandanavian names. Brewes=Bruce=Bruis=Bruse/Haraldsson=Haroldsson=Haraldson=Haroldsen=Haroldson, etc. Within the same nuclear family, siblings have differently spelled last names. (This actually happened in my grandfather's family, were as immigrants, brothers had variants of the same last name name in records.)