[davidmanze]

I am, there is a gradual change of focus ..... indicating to me a decent amount of cropping to get the greater DOF of a smaller sensor at around F11-16.  At no point looking at the right leg from top to bottom, is the focus equal  ....... giving a look of a cropped M4/3rds ( I mean that in terms of the cropped size of the APSc sensor)

https://www.flickr.com/photos/124690178@N08/43019700952/in/dateposted-public/

 This shot is a 15 image stack and all of the dragonfly is in focus !!

Yes, but your shot has no transition zone. You tried a composing with a blurred background to make the dragonfly look as if it's air-born, a fake "insect in flight" shot, so to say. In each focus stack there's a transition zone, depending on the used aperture.

But I think you're right. Several other shots also look as if they were done in one shot with a rather closed aperture and because the size of the pictures doesn't really get as big as possible, we can't see the diffraction related blur.

   Transition zones become milky looking if the focus is too far apart when stacking , so focusing has to advance in very very small steps, then the zones are invisible.

The whole thing was done on a long wooden board with large holes to stand all the greenery and flowers propped up behind where the dragonfly was pinned in place. (indoors with flash)
  ....... from the tip of the right wing to it's tail took fifteen manual exposures* to get it all in focus ....... the background was part of all the fifteen images and of course everyone was blurred  ...... 
 ...... the resulting stacked image just needed the pin to be cloned out and made good!!

* I think it was more like twenty images or more .....