I would say the thing that TCU does well is use Patterson's schematic knowledge to contain the run. It is well documented that Patterson's teams (despite often being undersized) are usually some of the top teams against the run each year. The reason being is that he runs his 4-2-5 defense differently that just about everyone else. An interesting read on this is found here from 2015:
http://grantland.com/features/hard-knocks-playing-defense-with-tcus-gary-patterson/
So what does that mean? Your coaches and players will be aware of it and will expect the running game to be tough sledding. But most fans just assume that they will be able to run the ball down TCU's throat all game and then are often frustrated when that does not happen. I also take comfort in the fact that the quality of athlete (on both sides of the ball) is much higher than in even 2014 and 2010 (arguably TCU's two best teams ever).
That said, as has been pointed out here, a lot of them are unproven. Turpin is a well known commodity, but true Sophmore Jalen Reagor may end up as one of the best WRs in the country when all is said and done (although he has not been much of a factor the first two weeks). Shawn Robinson is TCU's highest rated QB recruit, IIRC. He had offers from Bama, USC, OU, *ichigan, etc. As for the OL, hope springs eternal. TCU hired Chris Thomsen as OL coach last year and we noticed a marked improvement in the quality of OL play. The hope is that the next crop will have now been tutored by him for 2 years and will eventually be even better than the last crop. We'll see if they can hold up against OSU's DL.