When you think about it the stars aligned in a way. Barcelona couldn't get him because of signing Sanchez and he obviously couldn't go to Real Madrid. I think he needed to be sold too, there's a story I've heard that we let Atlético lie about the sale price to appease their fanbase.I was wondering the other day about how much Atleti Aguero would've cost these last few years and whether we'd be in for him at that price. I think by definition anyone good enough to be considered an Aguero "replacement" would require us to basically shatter our transfer record.
I'm going to be 100% honest, I don't think when he signed he envisioned staying for as long as he did. I have a sneaky feeling we were going to be a stepping stone to Real at the time; we had only won 1 trophy in our renaissance prior to his signing.
As to your question I think the only club in a relatively similar position to 2011 Atleti outside of England is maybe Dortmund. So I guess Sancho is the point of reference. Aguero would have cost a fucking lot.