Why some JOBs are not on Critical path on CA Workload Automation ESP Edition?

CA WA ESP Edition 11.4 Z/OS

If the JOB needs to show on critical path, then it has to be the predecessor or the predecessor of predecessor of the critical JOB.

Predecessors of Manual or External JOB won't show on Critical path, because the Manual or External JOB can be posted any time without waiting for the completion of the predecessors;

JOBs that hold the resource which is needed by other JOBs on critical path won't show on Critical path, since ESP won't check the resource contention.