There are different quotas for different station.
So Bandra to Nzm have General Quota which gets clears much faster than RLWL and PQWL respectively.
Providing 2 more halts won't much affect the general quota of delhi to mumbai.
Also Swm and Nagda are imp. Stops. Even August Kranti Rajdhani stops there so y not garib rath.