However, if you have enough references available, the multi color space match/predictions within a shot are the way to go:
Bluray:
Bluray matched to Tech IB with single color space method:
Bluray matched to Tech IB with multi color space method
It has to be said that the Star Wars bluray is notoriously difficult to regrade. In other cases the single color space method works really well, like for the Raiders 35 mm frame, and as such it's predictions are more reliable:
35 mm:
Bluray matched to 35 mm with single color space method:
