Question Number logic and progress

Currently a question display the quetion number for refrence to the enduser.

We implemented visibility handler, that now allows questions to be skipped.

What is the reasonable UX to do here, going from question 4 to question 7 because 5 and 6 are skipped leaves the end user with the odd question - "What did i miss".

Questions to answer:
1) Does it make sense to show a number? (Its nice that a end user can call and say i am on question 6 and dont know what to do).
2) Should the question number always be linear, so even if it jumps from 4 to 7, users are shown 5 as its the 5th question on their path. What does that do call and say i am on question 5, support wont know what 5 refers to?

What does progress mean when questions can be skipped?