Also, as much as I love the man, there's a pretty clear difference between a manager like Klopp and a manager like Rafa.
Rafa signed Josemi in his first season, Barragan and Kromkamp in his second season, Arbeloa in his third season, Degen in his fourth season and Glen Johnson in his fifth season. 5/6 senior right backs over five years, in addition to Steve Finnan.
Similar with goalkeepers. We already had Dudek and Kirkland here. Signed Carson, signed Pepe, signed Padelli, signed Itandje, signed Cavalieri.
I don't think for a second Rafa arrives in 2016 with Clyne and Jon Flanagan as his right backs and doesn't pretty immediately go out and sign another one. In an alternate universe he uses Barragan and Scott Carson as back ups in 2005, saves the money we spent on never ending goalkeepers and right backs and we end up having enough for Dani Alves or Sergio Aguero.
You see similar, with a larger budget, from Guardiola.
What Jookie is saying, I believe, is that Klopp quite clearly would rather use what he has instead of going out and getting not quite what he wants. Not only has that landed us monsters like VVD, I'd suggest its also helped massively with players like Trent. Again, no-one is saying he doesn't like to sign new players but there's pretty clear evidence that he doesn't just want to sign people for the sake of it. Its not to say he prioritises developing youngsters over transfers, but I'm pretty certain he'd want to be sure he doesn't have a solution at the club first before going out and spending.