I don't think anybody really knows who all of Pep's targets are, we have been linked with every man and his dog.
It's just an opinion of mine that I feel he should be made a priority. Reason being is that Sterling hasn't lived up to his hype and he's been pretty below par this season. If we sell Bony, we need another player to replace him, especially if Aguero gets injured as you can't just rely on a 19 year old kid to lead the line on his own up front.
With the Griezmann signing, as already mentioned you are killing 2 birds with one stone. Not only can he play as a lone striker, but he can play as an inside forward/ inverted winger too. So if Aguero does get injured, he can be trusted to lead the line and when Aguero is in the team, he can play in Sterlings position as an inside forward. After all, Pep Guardiola loves his wide men that can hug the touch line and make the pitch wide, but he also likes his attacking players to make diagonal runs through the middle in behind the oppositions defence and score goals, ala Pedro and David Villa at Barca. He would fit Pep's philosophy to an absolute tee.
He is literally the most perfect signing we could make for me. Like I said, if we don't go all out for Pogba, I would be happy blowing out budget on this man and signing a player like Xhaka or a player like Thiago who would be considerably cheaper than Pogba.
Aguero and Griezmann in the same team would be unplayable.