Raiders had option to sign Khalil Mack to deal cheaper than Bears extension before trade
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Khalil Mack headed to Chicago after Raiders and Bears pull off blockbuster trade
Bears or Raiders: Who won the Khalil Mack trade? - Chicago Sun-Times
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Bears' Khalil Mack dominates former Raiders team, Raiders News
The Raiders-Bears trade for Khalil Mack changed the NFL - Sports Illustrated
Bears Declared Winners Of The Second Khalil Mack Trade
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