I disagree with the statement that barcelona has better squad depth now because in fact Xavi often uses Gavi as a winger despite Ansu Fati and also despite Ferran Torres but Xavi prefers to use Lamine Yamal for the same position. This is clear when they have played a number of domestic league matches and in fact it has gone quite well and if Barcelona had good players for that position it would be impossible for them to risk players who are not in their proper positions or even install their academy players to be able to cover the gap. I think Xavi's rotation is very limited with the options available now and they need to have real targets to go further in the Champions League this season.
The thing I that most players at Barcelona are very versatile and can adapt comfortably to any positions they're played in and then if the preferred players for that position fails to impress the coaches in the training ground the coach could be left with picking up players that are capable of delivering even though it means them playing out of the preferred wing, that's you'll see a Gavi deployed from the wing when they've got Ansu Fati and Ferran Torres.
Well asides that the squad looks really balance this season and would likely perform better than they did last season even though they don't look strong enough to win it yet compared to other teams like Realmadrid, Bayern and Mancity, that's got more experienced champions league players in their team, however they've got the talent and there are still some players in the squad that are experienced in the Champions League as well.
Barcelona is playing badly statistically, they have conceded much goals the defenders looks tired and week in the back. The strength of this current squad is the midfield once the midfield is taking over by opponent,they are weak will score less. Xavi has to work on the defence line, if he will compete with Real Madrid this season, But Barcelona has a come back mentality, but won't work for them always.