It’s difficult to get any indicators from non-padded practices, but one in particular at Bears’ training camp seems notable — the Bears’ defense already looks like it will push the envelope of physicality and aggression under Alan Williams, especially in the secondary.
It remains to be seen if they can approach the line without crossing it, but if you do it right — like the 49ers under Vic Fangio and the Seahawks’ Legion of Boom unit in the past decade — you redefine what a foul is and often get the benefit of the doubt. But if you don’t do it right, it gets ugly in a hurry.