Maybe I'm trying to allude that Iowa coaches should react to situations:
Coaches, if you don't have the athlete(s) to pull off your favorite scheme(s), use schemes that might work with the athletes you have - that might be somewhat effective for the situation, then go out and recruit the athlete(s) you need for your favorite schemes.
You might find a different scheme , like TCU's D scheme, might be as effective.
React, be flexible, and prepare.
And how fluent are you concerning the offensive schemes that TCU had to play against? How familiar are you with the personnel that TCU has? Heck, you may not realize it ... but whether also pragmatically figures in what schemes work better than others.
It would seem to me that your remarks are seemingly ill-informed.
Iowa still needs to be able to stop the run ... so that tends to lead us to insert more of an extra safety in our formations that call for an extra DB.
However, remind me of our depth at safety .... yeah, that's right, it was one of the spots where we had the LEAST depth. Furthermore, Miller got dinged and wasn't up to playing for several games.
As for at CB, Lowe and Lowery were both dinged at various junctures of the season ... and from most reports Bernstine wasn't good to go either. Thus, that left us with Castillo as our primary option to turn to at CB. I think that Castillo is a perfectly good CB ... but he hasn't yet distinguished himself as a lock-down corner either.
My main question has been directed more to folks who might have been better aware of the health-situation of our guys in the secondary. That would have been able to point to whether we would have been able to implement nickel/dime packages at other junctures through the season.
Anyhow, many of the things that TCU does isn't all that dissimilar to what we do. Not unlike them, Iowa doesn't place an emphasis on making their LBs too huge. Rather, Iowa places plenty of emphasis on the LBs being quick/fast enough to excel in coverage ... and as a result Iowa's LBs are typically in the ball-park of 220-240 lbs. It wasn't that long ago when LBs were often even bigger ... between 240-250. Also, Iowa places an emphasis on our LBs being able to "play fast" ... and that is precisely what TCU does too.