i think you are a bit harsh on chanderpaul. Chanderpaul was a part of KRB that reached the SF of BPL-2, the Uva Next squad that won the SLPL. In t20s different players have different roles. You need someone to stabilize the top order, chanderpaul is the one to depend. T20 doesnt mean, it has to be a warner/gayle...many players like hodge, bravo, hussey has been very successful in this format.
Thats why BD fails in t20s at times. Its not only about big hitting. You need batsman who can find gaps, rotate the strike...something tamim and riad failed to do in that t20 match against WI