Everton can forget about Insigne because I don't think he will leave Italy. He might do it when he is young but now it is old and he will not take risk at his age. Moreover, Italian players don't want to play outside of Italy. There are very rare players accept risk to play in leagues that are not Serie A.
Chelsea have also managed to get Lukaku who is playing very well with Inter, the competition for the Premier League trophy will be more interesting. I predict the possibility
that the winner of the EPL trophy will be between Man City or Chelsea, and I also agree that Leicester will make it difficult for the big teams.
Getting Lukaku is a big transfer and a great achievement for Chelsea from the transfer market. With him, and his experience in Premier League, his past success with West Brom and Everton, I think he will be the best striker for Chelsea after Diego Costa. He will fix the weakness of Chelsea on attacking field. Chelsea will be very strong with him.
Yes, I believe Arsenal this season has been more solid than the previous season, so I also believe Arsenal will win even though this is an away match. There's no time to relax this time, I'm just worried that Arteta doesn't play all his main players, considering this is a promoted team I don't think the promotion team should be underestimated. So yes, Arsenal must still consider this an important match because after all points by points must be collected from the start.
I don't know. Arteta is lack of something important for a main coach. He and Solskjaer are lack of determination and experience but they are lucky because both Manchester United and Arsenal are very patient with those coaches.
The season is exciting for two clubs because they will have better view on their coaches. Arteta should manage to help Arsenal to join top 4 in Premier League. If not, I guess he will be fired.