Hi Vellendra,
Its interesting to relate my experience with how you described the general understanding of OCM as Communication and Training; at an assignment of deploying a SAP E-Recruiting Solution, when I was asked to assist technical team in managing the organizational change (on top of what I had already) I was also told "anyways you only need to communicate with & arrange some training for some of the stakeholders".
It was hard to convince my lead that OCM wasn't ONLY about these two activities (even though they are major areas with the work stream), as it wasn't seen as a transformation initiative anyways.
I believe PEOPLE element is the core and if its not addressed in an implementation, the risk of solution's rejection remains high.
Thanks for summarizing the key points and hope to hear more from you on the subject.