premise: Meshuggah is a Swedish experimental metal and death metal quintet formed in 1987 in Umeå. Meshuggah is known for its use of extended polymetric passages, complex time signatures, dissonant guitar riffs, and harsh vocals. As of 2008, the band consists of vocalist Jens Kidman, guitarists Fredrik Thordendal and Mårten Hagström, bassist Dick Lövgren and drummer Tomas Haake.
hypothesis: Meshuggah could never be a sextet.
reason: It is possible that a sixth member could join, making the band a sextet. I believe "never" tricked the system.