If the 2018, 2019 or even the 2020 team had the 2007, 2008 or 2009 defense, they would have won championships. I'll even throw the 2010 defense in there as well.
Brook's problem has always been being incomplete on both sides of the ball simultaneously. If Brook has a juggernaut Offense then the Defense is shaky, if Brook has a hard hitting defense, the offense is average at best