I'm unsure what opportunity he has had to bring something to this season.
I don't know what he's been doing at the few training sessions he has been available for. I suspect most outside of the club don't.
I would also say, if James doesn't feature for the club between now and whenever he leaves, I very much doubt that is due to Benitez 'holding a grudge'. Benitez will pick the team that he believes will have the best chance of beating the opposition, simple as that. His job depends on it. a job that he wanted, one that keeps him close to his family while earning a packet. If that included James, he'll play, if it doesn't, he wont. Nobody gets to the position these professionals are in by holding grudges.
In my humble opinion, James brings something that we don't currently have, the ability to draw players in and release the ball from tight spaces. That would inevitably work in the favour of some of our faster players, creating space for them, and delivering the ball where its needed. That works against high press teams. However, high press teams also use high energy movement with the ball, something that with watching James last season, he isn't particularly suited to. (Is a very different game when watching live though, so would like the opportunity to be corrected)