Arsenal are seriously lacking leadership on the pitch.
They have no driving force. The vultures are circling round Arsene Wenger but it doesn't matter how good you are as a manager, if you're missing that driving presence in your team, you're going to struggle.
I watched the match at Watford with a former Arsenal midfielder who had that drive — Emmanuel Petit. Petit had that presence, the way N'Golo Kante has it at Chelsea and Kevin De Bruyne at Manchester City.

De Bruyne isn't a destroyer like Roy Keane, but he can rip teams apart with his incisive passing.