Architectural Roles and Responsibilities

I found a post on Dinesh's Blog regarding architectural roles and responsibilities. I very much like the division and definition of these roles. However, I think the majority of companies combine these architect roles into much more traditional buckets: DBA, chief architect, and an application development manager. In fact, one of the more important roles in today's society, security, is just starting to get a more visible and political influence in organizations. It isn't that I don't agree that these roles should be identified and recognized, I just think it would be very common to see a name listed on several role definitions.