The only issue I see with this is that your point was regarding fishing a type of cover and now you're using data across all tourneys regardless of the cover/structure that was fished. Now if the tourney results said caught them in the grass with a soft plastic, then you'd be proving your point. Now, I dont' think you really are.
BTW, fishing the grass is rather broad. Are we talking deep weeds, shallow weeds, emergent weeds, matted weeds, floating weeds?