>>127634725
Almost all of Superunknown is two Gretsch Jets and one or two of Kim's Guild guitars.
Cornell used Gretsch guitars up until his death. His signature 335 also had Lollar filtertron style pickups. Most of the time when he used regular humbuckers was for songs that needed a very low tuned guitar.
Gretsch / Filtertron guitars blend incredibly well with regular humbucker guitars. They're have a more flat eq voicing that acts as a great bed for the mid forward regular humbuckers.