If I am an OBC and I get a seat due to my high rank I am admitted as a general category student. Nothing is deleted from the 27% quota. On the other hand if there are not enough non-creamy layer students to fill up the 27% quota then those seats are open to general category (means all).
Giving reservation to creamy layer is unfair, period. If creamy layer is included in the reservation all 27% seats will be filled. Now there is chance that some seats will get reallocated to open merit category
