There is no rule but unless 3 of the players you mention hit a LOT of goals, Liverpool won't score enough.
It's easy to say Liverpool have a great attack when they spank a side but then ignore/forget the times they have drawn a blank. Yes, all sides struggle sometimes to break down a massed defence. But the fact is Liverpool don't have the best attack if you take goals scored as the deciding factor.
Have they ever been PL top scorers? Maybe when Suarez was there, can't be bothered to check. Were they top scorers last season? Will they be this? Are they right now? No, not in my opinion and no again.