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Assume that $A$ absorbs the Jiang-Su algebra $\\mathcal{Z}$, the extremal boundary of the trace space of $A$ is compact and finite dimensional and that $\\alpha$ fixes any tracial state of $A$. Then tsr$(A \\rtimes_\\alpha G) = 1$. 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Assume that $A$ absorbs the Jiang-Su algebra $\\mathcal{Z}$, the extremal boundary of the trace space of $A$ is compact and finite dimensional and that $\\alpha$ fixes any tracial state of $A$. Then tsr$(A \\rtimes_\\alpha G) = 1$. 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