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I have to say I was really pleased I used my flash. I only have a 70-200 without using my 2x (which noticeably softens it) so at 200, some fill is nice. It brings out the colours in the sand and the seal and adds a catch light to the eyes (sometimes). 5, for example, would be very different without some fill to get the colours from the mouth. All of the images in the second post were with the flash, as well as no. 11, from the third post.
Interesting! How do the seals react to the flash? I'd be a bit scared that it would upset them?
I guess they're used to seeing a lot of photographers around from an early age?!