[Modernman]

Then that hippo like creature developed gills, balleen, ability to swim not sink

This is where you lost all credibility.

[RaceBannon]

Not me, but the people who actually believe that a mammal went to the land, then went back to the water and develped some sort of mechanism to breath underwater or breach the water and breath air, they are the people who lost credibility.

If all you are going to do is point out my lack of desire to over type an answer, then you show you have no argument.