Opinion on my wildlife focused trip in first week of July?

Greetings. This will be my second time ever at GTNP but first time as a camera owner. I was hoping you can critique the spots I intend to hit at dawn and dusk for Grizzly's: *Oxbow bend *Pilgrim Creek Road *Willow Flats (i read they hunt Elk calves here in June & July)

Do you think its likely I will see a Brown Bear if i concentrate on these spots? I will only have 3 whole days/ 6 attempts. (I know its not much) or should I try Yellowstone?

In addition I was hoping someone was generous enough to provide a location for a Great Gray Owl. 😬 I know thats asking a lot but I figured to try. Thank you so much in advance!