About the Fill Shape to Fill Shape Rule
If you have a brush stroke or a colour fill ( contour vectors), make sure that you morph it with another brush stroke or fill zone. It is important to undersand that strokes drawn with the Brush tool are the same thing as zones painted with the Paint tool. Vector points are located along the contour. They are simply not the same size. Contour vectors will not morph with pencil lines (central vectors). A brush stroke can morph into a colour fill zone and vice versa as they are the exact same thing.