Its CIC not your lawyers office where they will put in place all the missing documents or the Jigsaw puzzle. when they open the envelope they expect a "complete package" . whatever is incomplete they will simply return it just like the case of sachin1983. Until and unless you dont get UCI you can never add or expect them to add the missing documents to your file. its very simple.
For example , if today i send 1 application form , then tmrw i write a cover letter askign them to add my ielts results and then 1 week later ask them to add my Evaluation, .
In all the above case everything will be returned one by one ( depends on when they open each package individually). even if u write a covering letter written by Jason kenny himself.