I dont know where this comes from about rotary cant handle crops early in the day or very late, in fact in Iowa where I am quite the opposite is true, if you have problems with std rotor in green crops put toothed bars on back of rotor, part 1302103C3, only drawback is it chews up straw too much for baling. The specialty rotor doesnt need anything except more horsepower. Its like all these combine experts used to conventional machines comparing feeder house width, its not the same with a rotary, even JD puts a narrower feeder on STS than 9650 walker.