Is there any need for an InDesign user to use InCopy as well?

Question

We are looking to do a software refresh from CS3 to CS5, and when auditing users we discoverd a handful of people that are using InDesign and InCopy.  My previous thoughts about InCopy, was that the program isn't needed if you have InDesign, but users have given the following reasons for using both.  Can someone tell me if these reasons are founded, or if there is a way to do these things in InDesign only?
Example 1:  InDesign: Use to edit pages before going to press, cut copy to fit, re-write headlines and insert captions.  InCopy:  Use daily to perform first reads and content edits of stories submitted by writers and to write my own copy, and to format stories before sending them to the copy editor for final editing.
Example 2:  InCopy CS2 I use in conjunction w/InDesign when we create an issue.
Example 3:   I use Adobe Incopy CS2 several times per week to format and file stories with our copydesk. I also use Adobe InDesign CS3 to make cuts and late edits on page each week before my section ships to the printer.
Example 4:  Use both daily for printed materials
Input is greatly appreciated!  Thank you

Answer 1

Thank you John, for one user it appears he is doing to copy editing as well as the design.  He is using InCopy to format tex files before they are imported in InDesign.  Can you tell me if InDesign can be used as a word-processing software?
Here are exaples of a few of the other workflows: When I send stories to our copy chief, they have to be in an InCopy template for him to format the fonts. FM's two reporters send stories to me in Word, and I edit them before putting them in an InCopy template and sending them proofread. They then do an initial proofread for house style before formatting them and sending them to our art department for page layout in InDesign.
After the pages are laid out by our art director, I use InDesign in order to cut stories to fit, proofread and edit and write captions on page. Years ago, we had an additional copy editor to help our copy chief with this stage of the process, but he got laid off. They gave me and one other editor copies of InDesign at that point, so that we could distribute his work on shipping days. Since we're a weekly, I currently use both of these programs extensively every week.
It appears these users are wearing multiple hats, I was just under the impression that InDesign could do anything that InCopy does (and more ofcourse).  Apparently I was incorrect?