Just to be clear - that all happens only if you dressed just five players. If you dressed more but only put five of them into the depth chart, then coach would in most times play dressed players whose names are nor in starters, reserves or backup slots too.
And if you dress 3* or less players walkthrough with 25-0 takes place (with training minutes affected - to both sides)
*someone please confirm that I simpyl dont remember the exact amount