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I mentioned this before but I see slow progression of Walker in his three years:
Year 1: Played with his hair on fire, but out of control often.
Year 2: Under control more, but still out of position often, wrong lanes, blocked very easily.
Year 3: (small sample of 2 games), he is in position more often, but still struggles to finish the plays.
Yes, they are small gains, but gains none the less. He isn't going to be Ray Lewis, but I do think he is a starter in the NFL.
I do believe he is better suited for a 4-3 OLB, but no idea why that article said Cooper wasn't an MLB. I'd bet that once Cooper gets better acclimated, you will see him take the MLB with Walker moving out. McDuffie then playing Wilson's role in base only.