They were all done without a plug but the concrete was too watery on the aforementioned holes
Hole 10 is definitely going to erode quickly and it isn't a very good hole. Hole 14 will erode as well as it is already pretty eroded right there anyway. Hole 3 may be ok for occasional pin placement but I would like to see a pin placement on the edge of the grass about 70 feet closer than the existing pin. That way Hole 15 could be moved to hole 3's pin placement.