LAKE FOREST, Ill. — As the Bears’ 2026 rookie class roamed over the practice fields in Lake Forest this weekend, defensive coordinator Dennis Allen was able to demonstrate the specific schematic reason the Chicago Bears prioritized Dillon Thieneman in Round 1. While critics hollered for a pass rusher, Allen and the Bears front office focused on a future captain and communicator. One who has incredible football instincts and a 4.35 40-yard dash time. May 8, 2026; Lake Forest, IL, USA; Chicago Bears DB Dillon Thieneman speaks during Rookie Minicamp at Halas Hall. Kamil Krzaczynski-Imagn Images | Kamil Krzaczynski-Imagn Images Why Dennis Allen views Dillon Thieneman as the brain of the Bears secondary Failure by the Bears to draft a pass rusher or run stopper in Round 1 drew little criticism.   When it also happened in Rounds 2 and 3, the real hollering began.…