Joe,
you asked earlier about the concept of Ikkyo in the guard.
Again, it is conceptual/principal.
In the guard you essentially have someone that is squared off, balanced and focused on your center. Forget for a minute that he is between your legs.
Now in order for you do anything with him, you must move him off center. Sweep, kimura, omaplata...anything.
One way of doing this is to open your guard, and shrimp out to the side. for this example to the right. This effectively moves your center and his is still directed in the same plane. (Irimi). what do you do with your legs? If you are doing it correctly, your right leg is going high into his shoulder along the same line of force as ikkyo. Done correctly, you force uke over and you can continue around to the backside, on to omaplata, or what ever else you had in mind.
It principally is ikkyo. Omaplata is ikkyo done with your leg !
