KdB was the best player in Germany bar none and almost on his own dragged Wolfsburg to success. David Silva was linked to top-clubs since he was a teenager, played for one of the best clubs in Spain at the time, had a sensational Euros as early as 2008 but never left Valencia because they had this weird strategy of only selling him and David Villa as a hefty priced package deal until financial issues caused them to sell them seperately in the summer of 2010 for a more reasonable fee.
Yaya is the only one that perhaps wasn't as in that highest tier of attractive in the market, simply because he was seen as a more limited defensive player in that system. Still Barcelona were the greatest team on the planet back then and they still signed him so he definitely were highly-rated.
Those 3 along with Sergio and to an extent Nasri were definitely us going out and signing the most talented or best players we could find in the needed positions, as we did later with Haaland, Rodri and Gvardiol and as I expect us to do atleast twice this summer if we want to compete immidiately again