Competition made with Gravity Forms

I am going to create a competition-page where users can upload their progress in a gravity form.

- I create a webpage where i set up user accounts.
- The users are given login and a pedometer! (hehe)
- Once every week the users log in and fill in a form with the number of steps they have on their pedometer. They might also be asked to attach an image as proof of their progress.

I also want to make a top-list that displays the top-5 participants. The ones that have registered most steps.

Can this be done with Gravity Forms?

Maybe if a post is created every time form is filled out like so:
- Title: {user-id}+{date}
- Body: Here the user fills in their progress in steps like: 12432
- Category: {user-id}

If the above can be done, then the rest is coding. Accessing database. Maybe like this: http://wordpress.org/support/topic/add-up-the-values-of-custom-fields