I was referring mainly to his PR's. He always looks like he's running in mud. I never really see any burst. Maybe its our PR squad that just isn't opening holes for him. He's ok on KR's but still I'm waiting to see that 4.44 time you quoted. Again, perhaps a function of coverage.
If you've seen Berrios play on offense, you've seen that speed. He had some big plays on offense last year.