If we are going to be playing 4-3-3 pretty much every week then this is a no brainer. Realistically, we only have Aguero, Jesus, Sané and Sterling for 3 positions. One injury and we start to look a bit light going forward and it's worth noting that 3 of them are still young players who are susceptible to inconsistency. I think Bernardo is only being used on the wing out of necessity and if we sign Sanchez, he will start to rotate more with KDB and Silva as the season goes on rather than out on the left where his strengths are nullified. Alexis is a world class player who is still in his peak years, he clearly has a winning mentality, he works his arse off which rubs off on teammates, he's got Premier League and Champions League experience and understands Pep's philosophy. Also, the competition for places will prevent any players becoming complacent and give us a boost mid season when tiredness is starting to creep in. It might look like we are unstoppable now and that there's no need to change anything but it's a long season. I personally think this could be a genius signing.