I stopped reading after Downs has talent. He is the least talented TE that I've ever seen start at Tennessee. He is limited in the passing game, very poor route runner who gets zero separation and he is just horrendous in run blocking. Not sure where you see this talent coming from with him.
This roster Jones inherited was flat out terrible. Far worse than the one Dooley inherited in 2010. People keep pointing to the returning Oline this past year but conveniently fail to mention just how horrible the talent and depth were at every other position outside of the Oline and Dline (which was way too senior heavy and will be a huge weakness next season). I've never seen the WR, TE, QB, DB and LB positions look so awful as they were heading into the 2013 season.
Simms/Bray vs. Worley/Peterman/Dobbs - Push
Poole/Oku vs. Neal/Lane - advantage 2013.
Dmo, G. Jones, and Zro vs. Pig, Croom, North - huge advantage for 2010.
Stocker v. Downs - massive advantage 2010.
2010 Oline vs. 2013 Oline - It was basically the same, so massive advantage for 2013.
Offense overall - 2010 had better pass catchers, but I'd still go with 2013 being an overall more talented group.
Walker/Martin/G. Williams vs. Smith/Miller/Walls - Push.
Hughes/Thomas/Jeffery vs. McCullers/Saulsberry/O'Brien - advantage 2013.
Thompson/Reveiz/Lathers vs. Brewer/AJ - slight edge to 2013.
Teague/Evans/Anderson vs. Sutton/Coleman/Toney - slight edge to 2013.
Jackson/Waggner vs. Randolph/McNeil - advantage 2010.
Defense overall - even though they didn't perform particularly well, 2013 is definitely a more talented defense.
Lincoln v. Palardy - edge to 2013.
Obviously, this is a rough sketch of who I remember playing the most. Both teams were thin, young, and flawed. I think the 2010 was less talented, but by a small margin. Several guys on the 2013 team, IMO, have more physical ability, but coaching turnover and a generally sad culture the past several years hindered their development. Basically, higher ceiling for 2013 than for 2010, given maximum outputs for both teams.