Yes, the later hunt can produce some great bulls. BUT, there are many seasons where the migration does not really happen until the season is closed lately. It takes snow and cold to get them moving, some years it happens some it does not. Also, sometimes snow hits early, and by the last hunt the elk have already moved through. Its a crap shoot honestly. Every year is different with trying to hunt the migration. If the weather doesnt hit, you can spend 10 days riding 20 miles a day looking at nothing but country and grilzzlies, because the resident early season elk are already pushed out, and the migration herds are still in yellowstone. The benefit of the early hunt, is knowing the elk will be there. If you are want to risk weather in hopes of a giant, go late and cross your fingers mother nature cooperates for your hunt. If you chances at bulls, early is a much more guaranteed chance at getting into elk. Plenty of good bulls get killed early as well, but the migration is a pretty incredible thing if you get to see it actually happen.