Cotham is a 28 year old reliever with average stuff, the type of guy you can get on waivers sometimes. Maybe he has a decent season or two, but there's not much value.
Renda couldn't hit as a 24 year old in AA and doesn't possess standout power, speed, or defense.
I was perhaps a bit too harsh on Davis, but he can't command his breaking pitches and profiles as a reliever. There certainly isn't any considerable upside there in my opinion. He's got velocity, but not the 95+ that most elite relievers have.
I've always liked Jagielo and hoped to get him in the 2nd round in 2013, but he's just not enough for Chapman.