Look at a team like Manchester City, for example. When Phil Foden is integrated, he plays in a very stable set-up, some fantastic senior players who have been part of a winning culture that makes the transition that much easier for him.At Arsenal, the seniors have proved time and again that they're incapable.You're in trouble when you're being carried by players who are so new at this level, even if they're very talented.4. The questionable Mikel Arteta decisions:I back Arteta, but I believe as manager of Arsenal you're accountable for what happens on that pitch.Advert InsertedFirstly, the signing of Willian has been a disaster. At the start of the season, for over 3 months he was poor. But Arteta persisted and persisted... It took away minutes from not only Nicolas Pepe, but also Reiss Nelson who scored the winning goal against Liverpool in his last Premier League start... I find it quite baffling that he hasn't had a game since.Next, the decision to loan out Saliba is something I do not agree with. Yes, he's inexperienced but is also the perfect profile. When you look at Wesley Fofana thriving the way he is at Leicester City, Saliba was someone who is rated even higher in France. I get that Arteta might have wanted him to gain more experience, but why do that when he can easily play for this Arsenal side and give us great utility?The decision to persist with Aubameyang on the left is baffling and it was totally exposed yesterday. We struggled to relieve pressure down that side as Auba isn't a winger and someone who dribbles out of tight situations. Our best performances this season came when only one of Lacazette/Aubameyang played. The 3-1 win against Leicester, 2-1 against Spurs, 3-1 against Chelsea, and 4-2 against Leeds.