Scope and limitations of DNA matches

[LizzieL]

She's never been on my Common Ancestor list with a tree. All my common ancestors are colour coded and have notes attached. She has nothing because i have nothing to verify her connection with.  The thrulines Ancestry shows could be possible, but working top down is a little more difficult than bottom up and the family appears to emigrate to USA three generations back  to add to my difficulty. I have one person on my Common Ancestor list who comes and goes which I suspect means he's updating and unlinking then relinking his tree from time to time

[4b2]

I also have a few of these with no tree. It seems the only possible reasons are what was mentioned above, or Ancestry have made an error.

But from what I've seen with proximity to shared matches, these people with no tree listed on the match page are correct. So there obviously is or was a tree linked at some point.

Clicking on the name of the match takes you to a profile. I'd say about 5% of the time there are a tree or trees listed there, even if none are listed on the match page. So there are obviously a few particulars about how the trees are displayed.

[Glen in Tinsel Kni]

Some tree edits that can affect thrulines and changes to 'non searchable' status aren't instant, it can take time for them to come into effect.