I can understand some arguing he should be rested, but for me, he should start.
We're very early into the season, and he's been out for a long time, so the more exposure he can get the better for me. Yes, I don't want to see him being run ragged. But at this level, if your fitness is going to survive the majority of the season, the odd two games a week should not be a huge risk.
Plus, although he did well against Chelsea, he went long periods without too much involvement, this is a very different prospect and a further opportunity to really work on his interplay up top.
So for me it's less to do with giving the cup a proper go and more making up for the time missed to really harness his game