Drop Gio or Yeldon for Barber?

[Mr. Wizard]

For a little context, I'm in a salary cap league. I currently have Gio and Yeldon and someone just dropped Barber, who I'm thinking I should pick up on waivers. My thinking would be probably to cut Gio loose, but that costs me slightly more than cutting Yeldon loose -- I only paid Gio a teeny fraction of our cap, but it's fully guaranteed and I don't have a ton of wiggle room, whereas cutting Yeldon costs me practically zero (guys picked up in the offseason auction get guaranteed contracts, guys picked up midseason don't).

So really the question is also "do you prefer Yeldon to Gio, and how much of a difference do you think there is?"

Just for further details, the cap reflects the actual NFL salary cap ($177m I believe) and Gio's guaranteed money is a whole $1M, but I'm also pretty up against the cap. Granted, so's a lot of the league, but still.