The Modi wave in WB, while being unlikely to generate much in terms of seats, seems to be helping the Left Front which was left for dead as it has been hemorrhaging cadres at the grassroots level as a permanent Left Front government seems to be replaced by a permanent TMC government. The BJP, unlike in 2009, is running candidates in all 42 seats which will cut into the TMC and to some extent INC vote based. If Left Front can hold on to its 2009 vote share then it might manage to get 20 seats and beat back the TMC landslide.
I thought TMC and INC will benefit more from BJP strengthening, because larger share of their voters are Muslims who won't vote for BJP, especially Modi-led, under any circumstances.