Is the most effective egg pattern not even an egg pattern?

The pink "soft hackle" sow bug

• Size 18-14 scud or 0XL nymph hook
• Pink UV shrimp dubbing mixed with a little white rabbit dubbing
• Soft chicken hackle tips
• painted orange fire-bead
• pink or orange thread (I use 8/0 because thread buildup behind the bead grosses me out) 

It is no secret that Montana trout eat this tailwater fly in the winter.  Some agree that the fish are probably taking it for roe because generally, anything small and pink works especially well during this time of year. You will see this fly used in almost every tailwater however, I think that this fly has yet to see its day in the sun as a staple freestone fly!  

Over the past couple of winter/springs, I have tested this fly out on Western Montana's freestone streams and not only does it work, it out-fishes flies like the worm, rubber-legs stones, and even pink glo-bugs in the same size!  This really gives weight to the argument that trout are taking these for eggs because although sow bugs do live in freestones, they are in too low of numbers to attain this type of a response from the fish.  Also, they would be in a dormant stage in the winter.

The most damning evidence that this fly is being taken for an egg is that the soft hackle sow bug doesn't look like, or resemble anything close to, what a natural sow bug looks like.  Sow bugs look like potato bugs (otherwise known as rolly-pollies) and have flat bodies.  They are never pink in nature (that I know of).  Another strange thing is that the fly is called a soft hackle and is tied like one, but you don't fish it that way.  Tying a soft hackle sow bug doesn't make sense anyway as they don't really swim around that much and they definitely don't emerge to the surface to hatch.  Lastly, there is something odd about adding an orange bead to this already strange pattern.

My theory: 
The soft hackle sow bug was intentionally designed as a roe fly.  Its name is simply an attempt to clear the consciences of the people who use them.  For instance, it is looked at as "hacking" for a guide to put a client on fish with glo-bugs but it is highly commendable to fish a "soft hackle."

An actual sow bug fly

The dirty glo-bug in pink

So, if you don't have a problem fishing eggs, tie up as many of these as you possibly can.  I bet they work on every trout stream in America.  I've even used them ice fishing.

If you are the kind of person to give someone shit for fishing eggs, yet you fish these on your local tailwater -well, looks like you have egg on your face!