I don't know if Arenas will ever make a decent CB but those return highlights are kind of exciting. No dancing around - just hit the hole and go. He should get a lot of experience with returns this year with no upgrades to NT or ILB.
It looks like he is also a good blitzer. He kind of looks like Benny Sapp with return skills.
As for the reach aspect, I am going to pretend that Asamoah was taken at 2b (ChiefsCountry took him at 59 in the CP mock) and Arenas in the 3rd (less of a reach there).
Just trying to find a silver lining.