can pathauto tell which is the most recent alias when deleting?

pathauto 6.x-1.3, Drupal 6.16 (other modules are mostly the Acquia distribution). Before you call SEO-foul, hear me out.

When pathauto is set to "Create a new alias. Delete the old alias"... If there are multiple aliases to the node, which alias does it delete? The newest? The oldest? All? I did a test.

Example is node/35, path pattern is [title-raw]

First, I had one alias:
alias-name-1

Then, pathauto was set to "Create a new alias. Leave the existing alias functioning" and I renamed the node title. Now there were two aliases pointing to node/35:
alias-name-1 (created first)
alias-name-2 (created second, by pathauto)

Next, I switched to "Create a new alias. Delete the old alias".

I changed the title of the node again, thus creating:
alias-name-3

... and checked admin/build/path/list, expecting that the most recent alias-name-2 was deleted, leaving alias-name-1 and alias-name-3.

But instead, it deleted alias-name-1 ! This isn't the expected behavior. It should check to see which is the current alias before deciding which to delete.

Unless, of course, I'm missing something...