I'm just going to chime in here. First and foremost. Short barrels are COOL! They're shorter, less wieldy, lighter.....and in general....easier to "hump" around. Now true SBR's, as we all know, have one major purpose in life. And that is....to KICK the doors in! Or.....make a major assault in CQB. That's why they were designed.
A 16" barrel (in my honest opinion) is not a short barrel. Shorter....maybe....but not a short barreled rifle. They have their place for infantrymen (in my mind), but that's just it. They're not for the DMR's of the platoon. And their definitely not for the snipers of the platoon (or company).
They have their time and place. They have their accuracy out to a couple hundred meter's (on average).
Can "some" have better results than "others"? Well.....of course they can. Some guys are just better natural shooters than others.
my personal feelings.........nothing more.