Assumes revenue neutrality
In his simulation leading to the 5.4 percent growth estimate Diamond assumes that the Romney tax plan is revenue neutral. Yet Rosen is using the Diamond growth estimate to show that the plan can be revenue-neutral. Therefore the argument is circular.
This point was made by Dylan Mathews in a blog post. The relevant excerpt from the Diamond paper is also cited below.

According to Dylan Mathews the problems 
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Assumes revenue neutrality
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