2 reasons.
On my first sophomore team, I never allowed more than 17 points in any single game on the season...going 23-6-1 (and still managed to miss the playoffs - similar to last season). So I had that as a benchmark, which my defense was failing horribly at. I was
way to vulnerable to the run last season and I wanted to try out a zone blitzing scheme to add more pressure to opposing offenses. Passing I could shut down without too many issues (see the TT game).
And my offense couldn't block on anything longer than a 2 second pass attempt, and when I did get a pass off none of my receivers could catch. I'd never gave up so many sacks in my life...lol.
Since you can create rookies with experience I figured I would try different builds to watch their effectiveness...if it worked, I'd keep it, or not work and I'd re-roll again. Well you can see how that went

I used the last 3-4 weeks to tweak stuff to use in this season so I don't make the same build mistakes.