Brindavan Express - ರೈಲು ಹೆಸರು ಬೃಂದಾವನ್ ,ಇದು ಯಾವಾಗಲೂ Number 1 - Vijay Baradwaj

That's simply because both Bandel and Naihati are important junctions too. The whole Nadia district and Katwa subdivision of Purba Bardhaman are dependent on these two stations. Had they not been such important junction, they wouldn't have recieved halts of any ling distance train. For instance, just look at Barrackpore or Shrirampur. They are way more important and bigger cities than Bandel but still they dont get halts of the long distance trains.
Dakshineswar, on the other hand, serves only a few localities of Kolkata like Baranagar and Dunlop. On top of that, Dakshineswar has metro connectivity which makes transport way more easier than the other aforesaid stations.

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1. 13303 and 13319 at RNC end
2. 13329 and 13333 at PNBE end
3. Previously 18615 and 18045 had RSA at HWH end

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Earlier falaknuama exp had RSA with SC TPTY now falaknuama with ajantha exp
I don't know after LHBfication

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Now RSA is with Simhapuri AFAIK. It doesn't qualify here as RSA is at the PM end

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