I am not sure why you're so worried about "draw calls" - there is no clear definition of a draw call in the runtime. For example in the WebGL renderer drawing a sprite does not actually make a draw call - it just writes some vertices to a vertex buffer. Does that count? Also, more or fewer draw calls will be made depending on if the object uses effects, has a different opacity, and so on. These details are generally not interesting, because they have an almost negligable effect on performance. If you're concerned about performance, everything important is mentioned in the Performance Tips article, and anything not mentioned is not worth mentioning because it's probably not important.
As far as C2 draw calls are concerned (when it asks a plugin to draw itself), it makes a single draw call for every single visible object on-screen, and that's it. Offscreen objects are not drawn, and objects set invisible are not drawn (although objects with opacity 0 are still drawn). It doesn't matter if objects use different or the same frames, are from different or the same object types, there is one draw call per visible instance.