I hope the JAR that your co-worker wrote is an OSGi bundle. things are simpler then. You will have to deploy this bundle/jar into the container you intend your own project bundle to be deployed. eg: osgi:install -s mvn:<your coworkerJar's maven coordinates>.
If it is not an OSGi bundle then you can go ahead do a wrap to the dependency jar while installing.
eg: osgi:install -s wrap:mvn:<your coworkerJar's maven coordinates>
Hope this will help.
Although this did not solve all of my problems, it did solve some of my problems. Thanks!