While I don't disagree with the overall premise, Rishi Sunak has only been an MP since 2015 and this scandal has been going since 1999 so I am not sure the relationships you present:
Rishi Sunak -> Wife (Met 2004, Married 2009) -> Father -> InfoSys -> Fujitsu
Add up to any proof or even suggestion of corruption - just rich people know other rich people.
Yeah I dont know how Infosys-Fujitsu having a "close partnership" directly implies anything or implicates anyone.
Every big business has dozens if not hundreds of "partnerships".
I dont think someone at Fujitsu managing a big account like the UK post office would go out of their way to screw something up or cover something up because a partner company's co-founder happens to be F-I-L of the UK PM? Like what's the incentive here?
It's also ignoring the fact that if Fujitsu was rolled up tomorrow, Infosys would probably be better off for it, gaining a bunch of contracts that Fujitsu previously had.
Rishi Sunak -> Wife (Met 2004, Married 2009) -> Father -> InfoSys -> Fujitsu
Add up to any proof or even suggestion of corruption - just rich people know other rich people.