Not a big fan of Nketiah, but I don't think he's a problem in our squad. For me, Jesus is our best striker and when Jesus can't play, we should use Trossard there like last season. If Trossard is injured or has to play in another position (since he can play everywhere), then Nketiah steps in at striker.
He's only a problem when we use him more than we should. For example, if instead of using ESR/Nelson on the left wing, we push Jesus out wide to cram Nketiah into the lineup.