How? That 1300 per capita is after the revision of base year. Bangladesh is not growing faster than India! The gap will still remain the same, in fact the gap is expected to grow in coming decade. You just cannot bridge such a large gap without growing at a significantly higher rate than us for some years.
BD is still using 2004-2005 base year, whereas India recently moved to 2011-2012. Your 1800 dollar figure is using 2011-2012 base year.
That current 500 dollar or so difference in GDP/ capita will be cut by at least half when BD
rebases to 2011-2012 base year to calculate GDP.
As for GDP growth, don't worry as BD economy will grow by 1-2 percentage points quicker
when massive projects like Padma Bridge, Roopur nuclear power plant and the Matarbari coal plant/
port are completed. Since BD has a bigger impediment to growth due to poor infrastructure, it can improve
this deficit more than India can.