I'm sure no one is disputing that we need to score goals to win games and that sterling and sane can be wasteful in that area at times, but it seems you still missed the point that was made in the post you replied to. Goal threat is all well and good and aguero does provide that but if it comes at the expense of team fluidity and balance, that's where the problem comes in. I'm sure when pep bought Ibra for barca, he had it with the intention of someone to provide a goal threat and focal point, which to his credit Ibra did provide that, but he was still sold the following season once it became clear that the team fluidity suffered as a result of that. I'm guessing Pep is of the thinking that the team with the three of sane, jesus and raheem helps create the most number of chances and concede the least due to the work they do off the ball.
I think pep would been fine with aguero not being as good as the other three in pressing if he was consistently creating chances for him team-mates but when you see that jesus has contributed more assists than him in just three games than he has the whole season, then you start to understand why he's been dropped. It's also a reason why sterling and sane will rarely be dropped as although they can be wasteful at times, it was still them that created the two chances(with a bit of luck in sane's case)' that ultimately won the game yesterday. In fact in the 3 games that the trio played together since jesus' arrival, the team scored 9 goals and all three were involved in them one way or the other. This is not to say aguero doesn't have a role to play in the team as yesterday proved with his movement that led to the goal. But when fit sane, jesus and raheem provide the best balance for the team going forward meaning that while there may be chances that will be missed at times, the quality and quantity of those chances are more consistent and increased in comparison to when its with aguero in the team as he tends to be more single-minded in his approach to goalscoring which is a sacrifice pep is willing to make.