Not sure why youd want to add fats to a pwo meal... and it depends on what your goal is. Do you need more fats? Are you lean? What are your goals?
Yes, the COR is higher on the glycemic scale, comparable to a white potato... its calorie dense, a single ingredient, easy to digest. If it fits into where youre trying to keep your macros for the day, as a pwo, why add anything?
Negatively, it has been processed and stripped, losing much of the amino acids and fiber. Could try the brown rice COR too.
Maybe as a change from oatmeal for breakfast, try it with some fat here. Best way to find out is to try it...