That's clearly not true.
He has always made us a better team. The stats last season when he played we were far better than when he didn't.
He wasn't at his best, but he wasn't terrible - far from it.
He had several terrible performances last season. In part due to his injury, in part because I don't think he's ever really convinced in a flat double pivot.
These win with/without % ratios I've seen knocking about are an absolute waste of time. There's so many factors that can contribute to such a statistic that it's pointless even discussing it.
We've heard it about Matip, Lallana, Coutinho, Mané, basically any good player we've got whose missed a few or more games this season and we've happened to not win a game during that period.
Yes we miss good players when they're unavailable, which is amplified by our lack of squad depth. But them returning hasn't and doesn't magically make us into an unbeatable machine as people like to kid themselves either. I refuse to believe that playing badly or not winning is ever as simple as having one player missing. We won plenty of games of football whenever Luis Suarez, the best player I've seen play for Liverpool, got himself banned. So I'm pretty confident we can win games of football without any of those current players I've just mentioned.
If we have an injury crisis that's a different matter. But we don't. And I don't think we have all season, again as people have kidded themselves about.