I don't believe that changes my answer. Sorry! Workfront is just very black and white about how it works -- so using WLB means you would have to set up the project with whatever you call the bare minimum. So for example with the flyer schedule, you would have your 5 tasks:
1 content team role 1-3
2 unidentified team role 4-8, predecessor =1
3 unidentified team role 9-11, predecessor =1, 2
4 partner role or leave blank if they aren't included in your system 12-22, predecessor =1,2,3
5 unidentified team role 23-24, predecessor = 1,2,3,4
Then create your project. While mulling it over, you decide that you don't need the partner so you delete task 4. Your tasks are set to ASAP so task 5 now starts on day 12.
Long story short: yes -- to use WLB, you take every request and convert it to a planning project before it's reviewed. If it gets cancelled after the review, then that's what happens.