Inscriptions on Breschard, the Circus Rider, not by Gilbert Stuart

There  appears to be a good deal of confusion about the two inscriptions at the bottom corners of this painting. As has been shown by the National Gallery of Art, these two inscriptions were placed on the canvas years after the work was completed. The guesses as to what the names may be are both many and confusing. They were not added by Gilbert Stuart but by someone unknown which is what is meant by "later hand". The names are neither Ricketts nor Breschard. Not even the NGA uses these signatures to indicate who the actual sitter is.

http://www.nga.gov/fcgi-bin/tinfo_f?object=3160&detail=ins

from the NGA

Inscription

in a later hand, lower left: Portrait of / Mr Rickarts / Horse Equestraine [sic] / Friend of the artist / Gilbert Stuart; in a later hand, lower right: Portrait of Rickarts / Horse Equestrian / An Intimate Friend of / Gilbert Stuarts

These indecipherable inscriptions, added long after the painting was completed by someone other than Gilbert Stuart, are useless in deciding who was the sitter for this portrait.
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