I would like to see less emphasis on the dolphin being shown as #3, #4 and #9 are showing it, the abstract version like #7 is fine. I would like to see the logo being condensed I don't want a massive logo but one which is discreet but makes the point.
I would like to see the rowan tree included so some logos could be produced without the dolphin but with a symbolic rowan tree instead somehow, with #7 the symbol could be included within the circle that the abstract dolphin produces.
It might be worth considering how other companies that rely on their name do it such as Barclays, Rothschilds, Chrysler, Colliers, Coffey,
http://www.iveaghllp.com/ etc, There are very many examples of the one name type out there, what I don't want to see is designs similar to the "off the shelf" logos I can buy for $50!!
Change the slogan to United we Win, Divided we Lose.
Hope this helps but good start all the same, thanks for your interest.