Everyone is entitled to a period of poor form, but for me, that is something that lasts a few weeks, or at worse a couple of months. Sterling has been out of form for far too long.
KDB is widely regarded as the best midfielder in the world (and rightly so), he is having a below-par season by his own very high standards, but is still 2nd in the assists chart. Apart from a couple of recent games, he hasn't absolutely stunk the place out despite being below his normal high level. We are used to him being head and shoulders above everyone on the pitch, but this season he has been just another one of our very good players.