Post GW14: Son-Kane blank

Alright. The combo that I put my trust on is not paying off this week. I expect both Son & Kane to contribute some points but in the end the two players that I transferred out (Vardy & Justin) ended up with more points.. Unlucky. Good thing is my captain Bruno Fernandes really boost my points with 2 goals and 1 assist in his game versus Leeds. Another chance given to KDB is not that good or that bad, but with that premium price I expected a higher points contribution. The urge to transfer him out is increasing every week. Should I swap him out? Any suggestion?