Evaluate the logical coherence between the following judicial evidence and administrative inferences regarding promotional quotas:
1. Evidence 1: The Supreme Court issues its landmark verdict in the M. Nagaraj case (2006). Inference 1: Consequently, the judicial principle of the 'creamy layer' is formally extended to SC/ST candidates seeking job promotions.
2. Evidence 2: The five-judge bench in the Nagaraj case upholds the validity of the 77th, 81st, 82nd, and 85th Constitutional Amendments. Inference 2: Therefore, State governments are now constitutionally mandated and bound to implement SC/ST reservations in all public service promotions.
3. Evidence 3: The Jarnail Singh v L.N. Gupta (2018) judgment modifies previous judicial directives. Inference 3: As a result, states must now present exhaustively quantified data to prove the backwardness of SC/ST groups before granting promotions.