There is no such a person as "Scott Chase". Maybe you mean "Chet Haase". Chet joined the Android team in May 2010, way, way after Android became the success it is today.

Having said that, you are quite right to credit Romain for a lot of the UI we see in Android, and there's also a reason why he didn't stay at Sun: he was one of the few graphic engineers who actually cared about releasing good graphical user interfaces.