I agree with the pinch grip,, a lighter bow would be easier to manage,, like the Ishi bows,,,, 40ish or so,,
but when you read the accounts of the arrows shooting thought horses ,, and armor ,,etc,, probably a heavy bow
Jim Hamms books talk about 70 plus bows,,, I just think there was a wide range, and some of the guys liked or did shoot heavy bows even by todays standards,,,this design would lend itself to any weight bow,, is it simple but very efficient,,and great example of less is more