I think I agree with you. It is kind of counter intuitive. As sports fans, we are conditioned that teams/athletes "take on the personality of their head coach." I feel like that is true...mostly. We have definitely seen that it isn't true in wrestling. Zalesky and the Brands bros were as aggressive as any wrestlers we have seen in Hawkeye singlets, yet over time their teams evolved into passive wrestlers on their feet.
Why? I have no idea.
It is really all about the skillset coming into the room. Which is why recruiting is so incredibly important. Iowa, under Brands, seems to truly emphasize positioning and hand fighting over everything else. Work towards CLEAN setups and openings before pulling the trigger, which, in turn, minimizes scrambles.
Against lesser opponents they pretty much dominate. However, once they get to those equally talented, it can often look "boring" because they are holding position until they win the handfight enough to get a clear setup or "opening" to attack. Meanwhile, someone like Caliendo is so good at moving his feet and changing levels, while STILL holding great position and winning the handfights that he is much more able to set up and create openings than many of the other guys.
It truly isn't that Iowa is coaching kids that much different than any other top program. They just aren't bringing in the highest level recruits that already specialize in "spaghetti" wrestling or wrestling from space. Guys like Forrest have a wide variety of attacks and can chain wrestle to completion starting in so many positions, even when disadvantaged.
Hell, the most prime example is Vega. Many want to give all the credit to Taylor as the coach, but go watch his match against Bassett in Freestyle. Even then, he was damn near impossible to take down and with exposure criteria, I am not sure Bassett would have taken him down. Vega is the best I have ever seen at leg attack defense. Honestly, he is even better(SO FAR) than Askren was. His body type allows him to collect the high crotch right away and immediately start cutting the corner. If positioning changes, he pinches the head, if they come up to collect the hips he continues to control the head and brings in a leg and hits a cradle. If they belly back down he goes back to the crotch and finishes sitting the corner. He CAME IN with that skillset...
Edited to add: So I don't get yelled at by old school Iowa fans, Lewboo was GREAT at leg defense as well, but that was a different era. I am sure he would have adapted to how it is done today, but HOW Vega is able to do it now is the most impressive I have seen at the DI level...