More about the Chicago casting and changes in the staging from Variety (I didn't realize this was Hinton Battle's first big role.) I have no idea what they mean about LaChanze's vocal limitations though:
As has been Livent’s past practice with Chi-originating product, however, most of the principals in this production — including LaChanze, Peer Kevorian, Joe Dellger and Donna Bullock — have played their roles before in other cities. That is not true, however, of Hinton Battle. Perhaps that’s in part why the three-time Tony winner’s version of the ill-fated Coalhouse Walker is so strikingly different from that of Broadway original Brian Stokes Mitchell.
Physically slighter and far more emotional, Battle lacks the stentorian Stokes’ tragic magnitude. But he nonetheless turns in a fluid, vulnerable performance that’s probably more true to the character in E.L. Doctorow’s original novel.
Among the other principals, Vancouver vets Bullock and Dellger are both exceptionally poignant as the bewildered WASPs caught in strange new music. And if LaChanze and Kevorian have their vocal limitations, their acting is both strong and compelling.
Never one to leave well enough alone, Galati has usefully tinkered with some of his imaginative staging. The ensemble machinations around Sarah’s funeral look quite different from New York, as do the illusions of Houdini. The escapologist’s endeavors (and, indeed, his character) seem much more closely linked to the rest of the show in Chicago, thanks in part to a refreshingly less mannered performance from newcomer David Bonanno.