The galactico approach failed? That's a new one.
Regardless you can develop partnerships at the club. They don't have to exist beforehand. Pienaar and Baines didn't play with each other before Everton.
When Florentino Perez launched the galacticos: Figo, Beckham, Zidane, Ronaldo, Robinho, Ramos and Owen for about €280mil.
Adding to players like Makelel, Casillas, Morientes, Raul, Hierro, McManaman, Carlos and Guto.
1 Champions league
3 La Liga Titles
2 Supercopas
1 Intercontinental Cup
Thats over 7 years from 2000-2007.
For that amount of money in fees and wages they failed.
Not sure where your Pienaar/Baines axis has come from. It was a great combination for Everton at the time -- Baines was bought from Wigan and Pienaar had massively flopped in Dortmund.
You wouldnt have signed Baines because he played for Wigan and likely wouldnt touch Pienaar either as his 'stats' were awful.
Or are you saying Spurs (for example) should have signed Baines as well when they took Pienaar as a partnership?
Like Vasquez/James...or Godfrey/Aarons.
Most of this stuff is forged in training and its of a clear benefit for players to train together to create understandings on the pitch.
You can see Van Nistelrooy explain that he tried to nurture this with all the attack minded players such as Ronaldo and even Bellerin / Kleberson and Forlan. He'd speak with them about the runs he would make etc.