The only possible reason i guess is the presence of 1A coaches in various trains as Mumbai Mail (via Nagpur as well as Allahabad), CSTM-HWH Duronto, Jnaneswari Exp.,Samarsata Exp, CSTM-HWH Weekly Exp (the list may not be exhaustive).
That's what i think intuitively.
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But yes, removal of an A type coach and inclusion of HA type will make it look complete.