I gather it is the only known statue of him, but I wonder whether its presence might be due to a correspondence of names rather than a deliberate act. It is very tenuous I know, but General Auchinleck has, to my knowledge at least, no connection with Birmingham, However, William murdoch has a strong connection,and he was brought up on the estate of James Boswell at Auchinleck. i'd like to think that Auchinleck house was named after the estate, and that the council , or some rather thick developer, thought it needed a statue to look impressive, and who better than auchinleck the man. Probably all fancy i know, but.....