'Declined' mark in post-approved contributions

When starting as a contributor, not all users have a deep understanding of the specific technical procedures that go on the way. Now I understand the best way is to provide evidence for any contribution whenever possible or feasible. But sometimes the change I provide is so obvious that it seems just irrational to spend the same time (always limited) for this instead of evidencing other complicated cases.

This topic is intended not to find excuses, but for the only reason: the more 'declined' marks a contributor has in statistics, the slower a further contribution be processed. Is this formula actual for the contributions that are approved some time after they were declined (at least they still have such mark on stats page), or not?