How long have you had your Opensky? I say pay it off and close it. Use that money to pay on something else. It will still remain apart of your credit profile however will not factor into your utilization.
The affect would depend on your utilization of your other cards. Without the Opensky you would still have a good number of credit cards. 3 cards is the recommendation.
Close it. It has served its purpose, and there is no valid reason to keep it open longer.
Curious if you closed OpenSky, and if so, what happened? Did you run into any trouble? Did you get your deposit back in a timely fashion? I need to close mine soon, and wondering if you had any issues.