Yes Nino they can But let me ask you this if Brighton hadnโt played Arsenal would you have been convinced enough to say Brighton would beat Arsenal 3โ0? You only know the 3โ0 happened because they actually played So are you convinced enough to say Real Madrid or Barcelona can beat Arsenal 3โ0 before they even play? If yes then you also have to accept that Brighton can beat Madrid or Barcelona 3โ0 Football is played on the pitch not on paper