I don't argue with people about yield...I know how much I yield and that is all that matters.
With optimum conditions and many thousands of dollars of equipment...I think it is possible...My last big DWC plant yielded almost 6 ounces(after drying) and I don't use co2...I have gone to perpetual cloning and will not grow that big anymore, ......too much chance of herm's unless you really police the chit out of them.imho