Renovating the seats of a buffalo leather sofa

Hello, my sofa is in excellent condition and I do not want to replace it. The only snag is that the seats have worn from the rubbing of legs. I would just like to renovate the seats because the rest of the sofa is spotless.  Will recolouring, varnish and oil be enough to renovate it  or do I also need to use a leather scratch filler or a repair paste ?

Thank you for your replies