I've watched most of the 90's season reviews over the Christmas break and think these questions can be jammed in as semi-on topic haha

Why did Sainz go to Jolly Club?/ A Private Lancia team away from the vast resources of Toyota when the Delta wasn't being developed much then (since the factory effort didn't exist anymore)..

I was amazed that the '95 Turbo scandal (btw why didn't folks call it "wastegate" ? :P ) only had only a brief mention on the review despite it being rather a big deal!

Also is there coverage anywhere to be found of the W2L Cup rallies?? I found some YT footage of Monte '96 but it was more footage rather than coverage..

Yeah the ban did lead to some unusual activities in '96 for the "not TTE" team

Some coverage from the Manx '96 here:
https://www.youtube.com/watch?v=i3IUA4Qv4ww

As for the Corolla WRC, did Wevers Sport introduce upgrades in the Post TTE years? (engine management / maps?)