In fact all the new IIMs are developing and in a decade or two they might be at level with Kozhikode or Lucknow if not A B or C.
Now what sets IIM Ranchi apart from the other new IIMS is its HRM degree in addition to a PGP degree. This tactic has helped Ranchi gain alumni in the HR sector. These alumni prefer their own institutes for placements. Many other B Schools like XLRI and MDI have implemented this strategy to climb the ladder quicker than others.
Generally, IIM Trichy, IIM Udaipur, and IIM Ranchi are of the same level but this strategy has somewhat differentiated Ranchi from the newer IIMs.