The fact you don't think Pep is a good manager speaks volumes.
You use that 'give them Rochdale/Oldham with no money' line, but switch it the other way and give Rochdale/Oldham's manager £1 billion and see if they're any good.
There are levels to football management; managers like Guardiola, Klopp and Tuchel are built for the pressures of elite level football.