ADOP separate call for ADOP Cleanup

eBS 12.2.11 Linux

A document I'm following is doing the ADOP Cleanup as a seperate ADOP call, while this is technically possible in the same ADOP call.

In between those calls, it is resourcing the environment.

So, it's doing something like this: prepare, apply, finalize and cutover in an ADOP call

Source the environment (Run filesystem)

Another ADOP call with ONLY the cleanup phase

Question : is that seperate ADOP call, and setting the environment again (where obviously this is already done before the first call as well), is that necessary ? Why ?