IMO, Drew, Enfield, and Altman are probably non-starters.
IU Prez McRobbie has to sign off on the hire - and he's still there until June 30th. He was furious about the Sampson fiasco and said that Sampson should never have been hired.
In 2012 the NCAA placed Baylor on probation for three years. It was found that Drew and WBC Kim Mulkey had made 1,256 rule-breaking calls (out of more than 900,000). It was considered a "major" violation - even though the NCAA changed the rule later the same year. This in addition to the Hanner Perea situation.
Enfield and USC are still under investigation as part of the widespread fraud and bribery investigation that has been ongoing for several years. One of his assistants has been prosecuted and convicted.
Altman has been hounded by controversy because of his handling of two different incidents where his players were investigated on rape charges - one of whom had been recruited as a transfer despite having been accused of sexual assault at his prior school. None of the players were convicted but many, including national publications, demanded his firing for the way he handled those situations.
It seems unlikely that McRobbie would sign off on the proposed hiring of any of these three coaches with those clouds in their background.