Well, for measuring temporal AC, censoring would certainly not be appropriate, either with zeros or by collapsing.
High motion will be destructive to this in one way or another, for all of these cases.
So given the choice between no censoring and interpolated censoring, it is difficult. High motion has drawbacks for each. If no censoring is done, that will probably drive down the AC values. With interpolation, that will probably drive them up. Should you do both and expect to be in the middle? :)
It might indeed be good to compare a bit.
- rick