How to make Maven assembly plugin dependencySets d

Question

For example, a POM dependency declaration (this is just for demo purpose and not my actual code):

    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.1.2</version>
        <exclusions>
            <exclusion>
                <groupId>*</groupId>
                <artifactId>*</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>..</dependency>
    <dependency>..</dependency>

My assembly dependencySets descriptor:

    <dependencySets>
        <dependencySet>
            <outputDirectory>lib</outputDirectory>
            <includes>
                <include>*:jar</include>
            </includes>
            <scope>runtime</scope>
            <useProjectArtifact>false</useProjectArtifact>
        </dependencySet>
    </dependencySets>

From what I observed, the assembly will have extra jars (transitive) from logback-classic and my POM dependencies will not. How to make the assembly resolving the same jars as the POM? If possible I do not want to have duplicated exclusion again in the assembly dependencySets.

NOTE: I'm using Maven 3.2.3 in Windows 8.1 running on Java 6.