Evos debate other evos all the time...but in the scientific literature, scientific conferences, lab meetings and in labs every day..places where creationists are either not qualified or do not bother to go.
As to a unified front, there have been arguments in the past among evos on evolution issues...(check any thread on biological basis of race for example). But on the main details of evolution, evos do agree...the concept that there are major disagreements about evolution within the scientific community is one of the old misconception/lies of creationists that I was referring to...the things evos do argue about are way over the head of 99.99% of the creationists I have encountered.