We don't need to specify patterns, we *can* specify patterns. And if we want to specify patterns I think the suitable places are in class diagrams and interaction diagrams, not in component diagrams.
If we use DI for resource injection, I think we don't need to specify further, because it's a feature of EJB 3 container.
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In such scenarios where DI is used, where there is no requirement of ServiceLocator for container managed resources.
Use of Business Delegate is also not required in this case?
Business Delegate provides more than just loose coupling. If you're business tier is remote you'll probably want them to perform caching or implement retry logic