At a time in this season too, Arsenal was not consistent and they were losing and winning but now they are trying to be consistent I was impressed with skills and pressures yesterday against PSV Eindhoven in the Champions League. But even at that I don't think Liverpool will give them chance to take over them in the Premier League. Liverpool has plan everything to take this season trophy so whoever that is coming they are ready to crush them. Arsenal might take the second position in the season and the first position is Liverpool (reserved). But the table might turn if a team plays exclusively as you said.
Consistency? I think this is a what Arsenal has been lacking not just this season but for the past three seasons that they have been contending for the league, this season the lack of consistency grew worse and I am not surprised seeing them in this position at the moment, although many have predicted they would be the heir for the crown if Manchester City flutters but lack of consistency shows yet again.
The seven goals against PSV doesn’t change a thing about their lack of consistency because PSV have been awful too in their league and were poor yet again. More so a certain form in another competition doesn’t matter much in another competition, Arsenal can win big today and go ghost in front of goal the following match day.