Understating the difference between start process and sub-process as per the latest release in 24.4

1. Synchronous Start Process - Here, documentation says, we get the output of the process variable from child process to the parent process.

2. Activity chaining in Sync start process - Here the documentation says, Chaining through a synchronous Start Process node means the original process will wait for other process to complete before continuing. Any activity chaining in the started process is not connected to the original process, so a broken chain will not return process variables to the original process.

process variable will be returned to the parent process or not?. Please clarify

3. start synchronous process using start process vs sub-process

• As per this, if the parent child relationship isn't followed, how we are able to get the output variable as mentioned in point 1 documentation?
• If the Activity chaining in the parent and child are independent, why does the parent process waits for the child to complete? As per point 2, it says broken chain will not return the process variable to the parent process.

Please clarify.