Why can't I create a new version of a photo edited in an external application, without Aperture making a new copy of the newly created Tiff?

Question

When Aperture creates a new version from a RAW file, no new master file is created.  This makes total sense and I understand why.
When I edit a photo in an external editor (Photoshop CS6) from within Aperture, Aperture creates a Tiff file to edit in Photoshop and saves it along with the RAW original once I have finished editing it in Photoshop.  I understand why this is necessary too.  So far so good.
But if I then ask Aperture to create a new version from the newly created image edited via Photoshop, it creates another new Tiff.  I can't see why this is necessary.  Aperture should be able to apply further new Aperture edits to the newly created Tiff in the same way that it creates new versions from a RAW file without duplicating the master - by remembering any new 'recipe' changes applied to the Tiff.  It only needs to remember the edits made as the Tiff already now exists.
Can I stop it creating repeat Tiff files each time I create a new version from the Photoshoped photos?
Thanks in anticipation.

Answer 1

Hello Kirby,
I clicked on the 'Show in Finder' and it revealed a new file called IMG_0961 (1) which goes with the original IMG_0961.CR2 and the edited new tiff created for Photoshop which was called IMG_0961.tiff
I noticed also that a separate version I had previously created using Canon's DPP stand alone software and titled by me IMG_0961 (DPP).TIF (same thing but from a different original) does not form a new master file when I create a new version of that one.  I've tried this with a few images but when the original is edited in Photoshop via Aperture a second version of the Tiff is created for the 1st version of the image when I create a new version fo it.