The buck's weight doesn't matter. All the body does is confirm if he is mature or not so that you have a baseline to use for measurements. You don't add inches onto his score because he weighs 80 lbs more. You take measurement's based off the deer's head, eyes, and ears. For example, a mature buck in South Texas will be 16" from ear tip to ear tip. That's 6" for the head and 5" for each ear. However, if he isn't mature, then 16" is going to be too much. A 2 1/2" year old buck will probably only be close to 12-13" from ear tip to ear tip.
From your above post, there are several obvious mis-calculations right off the bat between your son's buck and the DT buck.
1. You are over-estimating the DT buck's spread. You have to consider that his right ear is angled forward and left ear is angled back. Hence, you cannot use his ear tips as a measuring tool. The DT buck is close to 20-21" on spread. That's 2-2.5" outside of each ear tip once straightened out. It is not anywhere near 23-25".
2. Mass is very close to being the same. You are over-estimating the mass on the DT buck. Both bucks have nice mass, but nothing exceptional.
3. The G3's are the same on both bucks. Heck, if anything, the DT buck is losing ground because his left G3 is 1-1.5" shorter than his right G3. G3s are identical on your son's buck.
4. There is only about 2.5- 3" difference between the G4s on those two bucks. Understand that by G4s on the DT buck, I am talking about his right G4 and drop tine (he obviously doesn't have a true G4 on his left). You have a 5" DT and 5" G4 on the DT buck. You have a 4" left G4 and 3.5" right G4 on your son's buck.
5. Even though you son's buck probably isn't quite as wide, his beams wrap around more in the front. That's gonna balance out the overall measurement. You are giving too much credit to the DT buck.
I posted the below photos earlier in this thread as a comparison, but didn't get much response. These two bucks are the closest comparison on this thread in terms of spread, mass, drop tine, and most tine lengths. If you deduct the additional G4 from the top photo and knock off 1" per brow tine, then you have two bucks are within a couple inches of each other. I'd like to get your comments on where you think the DT buck adds on 15-20" in regards to the top buck. It's just not there.
[This message has been edited by txaggie02 (edited 3/14/2012 11:50a).]