I dont think people need to be super administrators to write blogs.. What I can suggest is this:
1. Define a category in K2 called "Blogs"
2. Build a menu item with K2 Category type.. This is going to be your Blog Page.. Set this page to pick items from "Blog" category
3. Allow all pastrol staff to be Authors. For putting any blogs, they should Log into the System, as authors, go to Component >> K2 >> Add item and add the blog item.. Ensuring that it is put in the "Blogs" category.
4. Once they save the item, it will be displayed in the Blogs section... You can also add tags for these blog items, which will make it easy for readers to read related stuff...
Hope this is what you wanted to do..
Regards
K T