I have to say that I just don't agree with the assertion that Aguero is a creative player, or a number 10. At least, not in the classical sense of a player that operates between the lines of the midfield and defence and is as the fulcrum of a teams offensive movements.
The comparison with Romario is most apt, in my opinion, even if I'm not particularly keen on the number of players that are compared to others, these days. Aguero is a player that is short and stocky, and while he can certainly operate in a deeper role — though I am still skeptical about him being "creative" — he is at his best when he is playing on the last man, and running in behind the opposition defence. He is also extremely clever, and sharp, in and around the penalty area, and he uses his low centre of gravity and stocky build to "bulldoze" his way past defenders, knowing that they dare not touch him, for fear of giving a penalty away.
To be fair, his assist record is not bad for a player that is so young, averaging ten per season over the last two years, and I'm certainly not suggesting that he lacks the ability to involve himself in much of the build up, but most of the goals that I have seen him create have culminated in him running in to the channel between the centerback and fullback, and squaring the ball to a teammate. That is not the movement of a number 10.