Alex, Yes, both the Kaos and Ultrasport are pattern, or pattern like planes. Either would be a good next airplane if looking to learn and perform traditional aerobatics. Truth be told, my 3rd plane was a ultrasport 40. Loved it.

Coupling is the effect of one surface causing the reaction of another. For example, when you ad rudder at knife edge, the plane has a tendency to pitch up (pull to canopy) or down (push to gear.) But pitch is an elevator function, not a rudder yaw function. So in effect, we say the rudder yaw is coupling to elevator pitch. Another example, a trainer will couple rudder to aileron because of the dihedral of the wing, i.e. rudder causes yaw and roll. In the trainer, that may be a desired effect, but in a aerobatic plane, coupling is generally not wanted, i.e. you want a neutral plane that has no coupling among other things such as thrust/CG set corre3ctly, etc. You can modify/eliminate coupling effects by plane design and radio mixes.