Not trying to be argumentative with you Bullwinkle.
I agree, my big nine pointer was guessed at 3.5 based on antlers and body size, but the antlers would show to be 2.5 by this measure and I'd bet that had I gotten the teeth looked at, he's probably a 2.5 and would fit right into this chart.
I know several self-proclaimed QDM/TDM practitioners, that given the chance at a nice buck, won't turn it down regardless of how old they may think it is. What good is claiming to be a QDM/TDM guy if you can't show off some nice bucks that most guys will only ever have one chance at in their lives on public land. YMMV.
You may be different. I don't personally know you, but from the way you talk and the questions you ask, you seem to be of a different mold than the typical QDM/TDM guys I know and I say good for you if that's what turns the crank for you.
I like big antlers, but I like venison more. I shoot what is a trophy to me at that given time and place. Some pretty nice bucks have walked and some young bucks have fallen down for no particular reason. I don't claim to be a trophy hunter and don't own land, so trying to call myself a QDM guy is pretty futile. I would call myself an opportunist.