I don't think his experience and how he works with Jabob should be underestimated in how well Jacob has come on this year. Jacob has been learning his trade from a former All Black, and that, coupled with how well Fekitoa is playing compared to his time at Toulon, shows that Sopoaga's influence isn't just what he does in the 80mins.
Some of his play in recent weeks has been at the level we have been hoping he would play at and I for one am glad he seems to have found his place in the team and is enjoying Rugby at Wasps as that can only be good for the team.