Board Thread:Site Discussion/@comment-26441403-20170706044339/@comment-1478040-20170706120626

While that may be obviously true, it is not confirmed if the Illegals manga is canon nor does Kohei Horikoshi acknowledge that the Illegals manga is canon. So until the Illegals manga is officially confirmed to be canon or when Kohei Horikoshi shows the Illegals characters in the My Hero Academia manga, Stendhal and Stain are seperate entities as of now.