The problem with TCU in 2014 is that they had the same record as Baylor, who beat them head to head. The problem with Ohio State is that they had the same record as MSU, who beat them head to head. In both cases, it was settled on the field. If anyone had an argument in 2014, it would have been Baylor. When there is a head to head result, everything else gets thrown out. There was no objective justification for putting either TCU or Ohio State in the playoff in either year. Neither team deserved to be there.
When selecting the 2014 Final Four, the committee reviewed the entire resume of every FBS team, which includes every game each of them played not just one key game for each.
Then, the committee selected
Alabama which lost to an Ole Miss team, that ended up ranked #9 by the committee, by 6 points
(TCU beat that same Ole Miss team by 39 points in their bowl game),
Ohio State which lost to a Virginia Tech team, that ended up unranked by the committee, by 14 points at home,
and Oregon which lost to an Arizona team, that ended up ranked #10 by the committee, by 7 points at home
over TCU which only lost to a Baylor team, that ended up ranked #5 by the committee, by 3 points on the road.
When selecting the 2015 Final Four, the committee reviewed the entire resume of every FBS team, which includes every game each of them played not just one key game for each.
Then, the committee selected
Oklahoma which lost to a Texas team, that ended up unranked by the committee, by 7 points,
Alabama which lost to an Ole Miss team, that ended up ranked #12 by the committee, by 6 points at home,
and Michigan State which lost to a Nebraska team, that ended up unranked by the committee, by 1 point
over Ohio State which only lost to a Michigan State team, that ended up ranked #3 by the committee, by 3 points.
In 2014, TCU may have been the best team in the country, but, they weren’t given a chance to play for the national championship on the field. A committee eliminated them from contention.
If we had an 8-team playoff system in 2014, Baylor would have had a chance to play for the national championship that year too. A committee eliminated them from contention.
In 2015 Ohio State may have been the best team in the country, but, they weren’t given a chance to defend their national title on the field due to one late regular season loss. A committee eliminated them from contention.