H&M City Sofa Body Oil Stain

[KenJan]

Hello,

We purchased 2 H&M City Sofas back in May of 2015 at the KR and have been really pleased with them. Unfortunately, one of the cushions (see attached Pics) has a terrible dark stain, which I think is a body oil stain. Not sure, but I think we made it worse by trying to clean it with a leather cleaning kit and it seemed to only make the stain bigger. That one cushion is the only problem we have had with both sofas after 7 years of use.

The leather is Weston Tobacco (unprotected).

Is it even possible to replace the one cushion (and match the existing leather) or is cleaning/refinishing the cushion the only option? If cleaning/refininshing is the only way to go, any suggestions on who could do a good job?
We are available to stop by the KR and actually show you guys the cushion, if you think that would help us to solve this problem.

Thanks very much!