I don't know about him actually scripting anything but it's easy to see how his quite unorthodox interpretation would've been difficult for the writers to work with.I can also imagine the producers wondering what direction the show might take after three full series with Eccleston and if it was a direction they were that committed to going down. In a way Tennant was the far safer option, bringing the series back to familiar territory, while at the same time fully compliant with the show-runner's apparent obsession with upping the love-story angle.
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