Hell Cam your stating the obvious once again. (sorry bit harsh)....
Coverage is something 6 years ago we all talked about good it come around again and although bat sizes have changed coverage has not is all important to club cricketers because we do not hit the ball in the same place all the time.
the 1271 in this thread is the best bat in terms of coverage in a normal sized cleft because it has been calculated to use most of a cleft even though it only has 34mm edges.
http://custombats.co.uk/cbforum/index.php?topic=23466.0big edges do align and keep stiffness in the blade but if it concaved then your losing coverage.
the zizi was designed for coverage evenly over a space for a equilateral balanced bat with wood all over shape was not liked but over the next 12 months more shapes will become this.
If you have scalloping/concaving normally it a ploy to keep the weight down but at a cost.
I always have said this and the diagram below will show this
concaved bat profile
coverage (show with paper) i call form bat narrower middle
full profile with edges above 38mm
coverage
It is about getting the bat that suits you 100 per cent and the 1271 is very similar in some ways to the Scat.
It's about allowances and finding what suits but coverage should play a massive part in our bats as we tend to hit the ball all over the place edge plays a part too.
This is my theory anyhow and in the bats i have used have found this