Maybe this is just a matter of choosing to view the glass as half full or half empty, and I certainly hope that your optimism is merited, that you are right and I wrong. But in all four of our losses to date we have had plentiful opportunities to win, and have wasted those opportunities by errors at all positions in all three phases of the game. There is no one thing (e.g. QB play) that is more obviously to blame, and therefore I don't think it easy to identify an area of youth and/or particular injury concern as an/the achilles' heel of this team. Rather the problem seems, on the basis of 'eye test', to be lack of readiness and execution across the board. That's not encouraging and typically points to coaching deficiencies.
It isn't easy to win with freshman QBs, but it is possible. Your QB needs to be talented (check for TCU on that score), your skill players need to execute consistently (nope), your game plans need to be excellent (nope), and your defense needs to be first rate (nope). We have the talent to do these things, but they aren't being done.