Overview: Some returning nameplates strut into a new model year with the braggadocio of a heavyweight prizefighter returning to defend a title. Others just slink in and take a seat in the back, preferring to let their skills do the talking. The 2017 Chevrolet Impala sedan definitely is one of the latter. Comprehensively redesigned for 2014, the 2017 version arrived devoid of hyperbole, …