I'm not sure what a "working CLN" is. I think Jacques is talking about merging into a temporary LNAB, e.g. choosing Grenville without being certain of it.
Strictly speaking, this is not acceptable. The "multiple redirects" problem is real. We need to be careful when doing a large number of merges that they all go into the same final profile instead of in multiple directions.
As pointed out separately by Lianne, the explanation is here: http://www.wikitree.com/wiki/Project_protecting_and_merging#Background:_The_multiple_redirects_problem
Of course, that's easier said than done. The problem Vic is having -- a very common problem for all WikiTreers who do a lot of merges, like Jacques -- is that you don't know which LNAB to use.
What Vic is doing here is correct. She's asking for help from project members in choosing the LNAB. But she's not getting an easy answer.
I don't see an easy answer on any of this. Choosing a final LNAB can be hard but merging into a temporary LNAB causes problems.
If you're only talking about one or two merges you don't need to obsess about the LNAB. If you're talking about lots of them ... you kinda do.