After doing Throw-n-Mow for many many many years and trying lots of different combinations, I am now 100% convinced that the thatch can be left standing. I've mowed, I've re-mowed to even the thatch, I've rolled, I've crimped, I've done everything I can think of to put thatch down. I've also left it standing, many times side by side with thatch that is down. Every time it grows just as well in the standing thatch as it does in the layered thatch.
In my mind it makes sense that a layer of thatch creates a greenhouse affect that helps retain moisture and heat. Time and time again I've been proven this isn't necessary. I guess nature has developed seed that doesn't need a mower or plow to grow. Imagine that!
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