skillsofts & threading, why cant you?? Options

[Pat]

So I have noticed it mentioned a few times on the forum that you can't thread skillsofts, but I'm having trouble understanding where that opinion. Comes from.
So let me share what I have gleaned from my research and hopefully someone can point out the flaw in my understanding.

You pick yourself up the nifty biowire echo. Then you go out a and get a copy of the "mundane" skillsoft. Then you use a specialized version of threading called emulation to copy the skillsoft. Successes on the roll determine how high the rating of the emulation is, up to the actual level of the skillsoft you are copying.
You then have a choice. You can sustain the current threading with the associated penalty, or choose to spend karma to create a CF version.
Now, while emulating, you can't thread higher on the fly for two reasons. One, you are already threading to create the emulation. Two, your emulation is an attempt to copy, you can only copy it so well, until it is exactly the same.
Once you spend karma however, by RAW it is no longer an emulation, it is now a full blooded complex form. So by RAW any complex form can be threaded on the fly to a higher level. The two reasons for not allowing threading are no longer there. You have your own CF version and as such you can now thread it on the fly.
Granted, you can thread it to a million, but its use is limited by your submersion level, as per the biowire echo.
Have I missed an entry somewhere? Have I misread something?