Why is Shatrughan Sinha Preferred Over Yashwant Sinha?

Strangely Ms Mamta Didi preferred Shatrughan Sinha ignoring Yashwant Sinha, who is in the party for more than a year. Sources say the Asansol constituency is having non-Bengali voters in the majority. Babul Supriyo was representing the constituency for BJP but after his joining of TMC, sources say Mamta Didi wanted high profile candidate to contest and it is not a secret that Shatrughan Sinha is having very close relations with Didi probably this has helped to go in favor of Shotgun instead of the old guard and a very strong defender of the TMC policies everywhere. Shatrughan Sinha is eagerly trying to come to parliament but his defeat as a Congress candidate in the last elections had dampened his enthusiasm sources say. The nomination by TMC probably will fulfill his dream to join the parliament soon but it's not easy because BJP has also given the ticket to high profile fashion designer Agnimitra Pal, two time MLA from south Asansol. Babul Suprio probably not given ticket due to change of coat and in all possibilities, opposition would have made this a main election propaganda?