It would be better if we have most of the demo product data in product or maybe in order component. Because almost all what can be done concerning ordering in ecommerce can also be done in order manager from which anyway ecommerce depends on
More generally each component should have the data to be able to work as much on its own as possible. Even if that means redundancy of some sorts. Most of the time, we can avoid redudancy when there are components dependencies and the component data are loaded after the main one.
This is when https://cwiki.apache.org/confluence/display/OFBIZ/Component+and+Component+Set+Dependencies helps and shows why it should be actively maintained! For instance I'm not sure we show data loading order there...