Questionable whether relievers even should be considered for the Hall of Fame - much less unanimously.
It’s not a question to HOF voters, who have put a number of relievers in already.
You're going to see plenty of more relievers getting into the HOF, since the role of the relief pitcher has gotten so much more important as the dominance of starters has declined.
Mussina really surprises me in this group. He put up good numbers over a long career, but I don't think he was ever considered a dominant pitcher -- let alone one of the best in the major leagues -- at any time in his career.
Unfortunately, the induction of Harold Baines into the HOF is an acknowledgement by the voters that 20% of the players who were in the big leagues for at least 10 years could conceivably end up in the Hall of Fame.