This grizzly bear is not being selective eating this pink salmon. Looks like the “whole” fish is to be devoured not just the eggs or the other high fat body parts. The closer it is to the end of the salmon run and therefore hibernation the more likely it is that all the salmon is eaten. It comes down to numbers; the number of days left to put on sufficient number of pounds to survive the winter. Fat brown bears are more selective and this bear’s belly is a little to far from the water meaning that it does need to add some bulk.
The overcast day may not seem too appealing unless you think about taking pictures from a boat. On bright days it is necessary to have the sun at your back or the reflection off the water will make picture taking difficult if not impossible. Marine mammals often change their direction of travel without notice and do not always cooperate in getting the boat in the right position. On a dull day their cooperation is not necessary. Again the motor in the picture is to provide an indication of the nearness of the orca pod.