What happened: Matthew Stafford said he has not had a backfield pair where both options can do everything. He identified Kyren Williams and Blake Corum as interchangeable pieces for the Los Angeles Rams.

Why it matters: Interchangeable backs let the Los Angeles Rams change personnel without revealing run or pass intent. That versatility helps sustain drives and keeps defensive matchups under stress.

What to watch: Watch how the Los Angeles Rams divide snaps and situational work between Williams and Corum.