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Redshift $z=9--10$ object selection is the effective limit of Hubble SpaceTelescope imaging capability, even when confirmed with Spitzer. If only a fewphotometry data points are available, it becomes attractive to add criteriabased on their morphology in these J- and H-band images.  One could do so through visual inspection, a size criterion, or alternatemorphometrics. We explore a vetted sample of BoRG $z\sim9$ and $z\sim10$candidate galaxies and the object rejected by Morishita+ (2018) to explore theutility of a size criterion in z=9-10 candidate selection. A stringent,PSF-corrected effective radius criterion ($r_e<0\farcs3$) would result in therejection of 65-70\% of the interlopers visually rejected by Morishita+. It mayalso remove up to $\sim20$\% of bona-fide brightest ($L>>L^*$) z=9 or 10candidates from a BoRG selected sample based on the Mason+ (2015) luminosityfunctions, assuming the Holwerda+ (2015) $z\sim9$ size-luminosity relation. Weargue that including a size constraint in lieu of a visual inspection may servein wide-field searches for these objects in e.g. EUCLID or HST archival imagingwith the understanding that some brightest ($L>>L^*$) candidates may be missed.  The sizes of the candidates found by Morishita+ (2018) follow the expectedsize distribution of $z\sim9$ for bright galaxies, consistent with thelognormal in Shibuya+ (2015) and single objects. Two candidates show highstar-formation surface density ($\Sigma_{SFR} > 25 M_\odot/kpc^2$) and allmerit further investigation and follow-up observations.

The Sizes of $z\sim9-10$ Galaxies Identified in the BoRG Survey