On the Relationship between Mutual and Tight Stationarity

We construct a model where every increasing ω-sequence of regular cardinals carries a mutually stationary sequence which is not tightly stationary, and show that this property is preserved under a class of Prikry-type forcings. Along the way, we give examples in the Cohen and Prikry models of ω-sequences of regular cardinals for which there is a non-tightly stationary sequence of stationary subsets consisting of cofinality ω1 ordinals, and show that such stationary sequences are mutually stationary in the presence of interleaved supercompact cardinals.