One thing to note is that the owner of Mancity's worth is $34bn and the owner of Newcastle's worth is $320bn! Almost 10 times that of Mancity's. So if Pep can spend around $200million on each window, they can easily spend $500 or maybe $1bn each window.
That is quite huge and any manager with such funds at their disposal can built a dream team from scratch. Few decades ago Newcastle was more informed that Manchester city then the oil money came and turned things around. Newcastle has been bought now and I can see same thing happening again. Already the mindset of the club owner is to win. Just like Leicester City winning the premier league from no where I would not be surprised if Newcastle also win in next few years.
The main priority now has to be not getting relegated. Can Newcastle buy new players in January? If they can, they should start planning towards that because it will be bad business if they get relegated after getting this massive buy deal.