Obviously,
Firstly they wanted to divert Raj via LAD to speedup, later on after diverting via LAD they diverted it via CPU CAR, Overall not much speedup can be seen considering the previous TT of Rajdhani. If one really cares about Ranchi Rajdhani, they should have asked for completion of RNC - SANKI - BRKA route and then after diverting the rajdhanis via RNC SANKI BRKA HZBN KQR route.
Which would be shortest path to NDLS from RNC. BUT they won't, they only look after what benefits them.
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Previously they all wanted to divert Purushottam triweekly via CIC and also wanted to divert 18610 via CIC even after knowing that the purpose of this train is to cater BKSC & GC