Top: The fraction of sources in each X-ray Flux bin with a match and with a reliable match in the DP1 Object catalog. The error bars show the standard error. The fainter X-ray sources are dominated by sources from the CSC2.1, which are generally well localized, leading to an increase in the fraction of sources with reliable matches. Middle: Excluding the E-CDF-S field, which is both the best observed by X-ray observatories and by DP1, we see that the fraction falls off strongly with absorbed X-ray flux. This is more indicative of what we expect a crossmatch to early Rubin (e.g., DR1) data may look like. Bottom: the main factors impacting our reliability score are the X-ray positional error and the density of Objects around the X-ray source.