If you have the review statements from your grant, and the "investigators" section says something along the lines of "The applicant is clearly a leader in the field and is ideally suited to carry out this reasearch", I would think that would provide very strong evidence rather than recieving the grant itself-- as pointed out by fandy, there is precedence to not count grants as anything extraordinary since we all need them as part of our job.
Of course if you have a K award or other "training" grant, that could hurt you more than help you-- it implies that you need additional training.
While Raj97 used a grant as a separate category, we have no way of knowing whether it mattered or not... he may have had approval based on meeting the minimum criteria, so all the "extra" stuff just didn't play into the equation-- I think I have seen examples of this in the AAO decisions as well.
Just my thoughts-- the most important thing I've learned from this process is that the things that we consider important from an academic point of view (e.g. getting grants!) don't necessarily equate to the USCIS point of view-- it is all about objectively meeting the criteria-- at the end of the day, the adjudicators are very aware of what things are "routine" in academia... publishing, getting grants, reviewing for journals occasionally, etc. You need to find ways to craft your "routine" achievements to meet the wording of the criteria.
Just my thoughts... best of luck to you!