Gerahead's 71 Dart

I noticed this when I replaced the quarter on the passenger side as well and can't figure out a reason for it..............the outer wheel house has two slices, at a right angle to the edge of the pinch weld flange at the 10 and 2 o"clock positions. Anyone have an idea why they are there? Any reason why I shouldn't weld 'em up?
While I am waiting for my new AMD trunk extension to show up, I've been putzin' with the little stuff. I welded up the holes in the wheel house flange from the old wheel well molding, filled in a couple of places where I got a little carried away and created bull's eyes with my spot weld cutter. There was a HUGE gap where the inner/outer wheel house seam and the trunk floor extension all come together. That corner somehow got pushed out from the direction of inside the trunk and created a big hole at that junction. Got out the BFH and coaxed her back where it belongs. Man, that took some serious force to get bent the way it was! Making dust and shakin' lots of stuff loose #-oL8r