I see these reports[0] saying - > the same sophisticated hacking technique – known as a “zero-click”
[0] https://www.reuters.com/technology/exclusive-iphone-flaw-exploited-by-second-israeli-spy-firm-sources-2022-02-03/
"Technical Analysis of Pegasus Spyware" https://info.lookout.com/rs/051-ESQ-475/images/lookout-pegas...
Another starting point is to start at LinkedIn, see who is working at Apple and mine for words iOS Team. They go back in their past job history.
As incredible as it might look to you, due to hubris, many do not remove their past work and project history. Could be another starting point, so as to investigate how come so many zero days seem to come to the same team ;-)