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Simulational studies of spin glasses in the last decade have focussed on theso-called replicon exponent $\alpha$ as a means of determining whether thelow-temperature phase of spin glasses is described by the replica symmetrybreaking picture of Parisi or by the droplet-scaling picture. On the latterpicture, it should be zero, but we shall argue that it will only be zero forsystems of linear dimension $L > L^*$. The crossover length $L^*$ may be of theorder of hundreds of lattice spacings in three dimensions and approach infinityin 6 dimensions. We use the droplet-scaling picture to show that the apparentnon-zero value of $\alpha$ when $L < L^*$ should be $2 \theta$, where $\theta$is the domain wall energy scaling exponent, This formula is in reasonableagreement with the reported values of $\alpha$.

The droplet-scaling versus replica symmetry breaking debate in spin glasses revisited