Sir i don't think trains like 12827/28, 12883/84 will be diverted via Masagram any day.
Train 12827/ 28, 12883/84 has many passengers between Howrah and Kharagpur, Midnapur, Garbeta,Salboni, Bishnupur,etc stations,
Also ER will not provide Slot between Howrah and Masagram for so many SER trains.
1 Intercity exp train and 2 MEMU between Howrah and Bankura/ Adra via Masagram is...
more... all that can be expected..... other MEMU trains will be between Bankura and Masagram only.
This is just my thinking.