Tim Dutaud, the Conservative ex-candidate, dropped out shortly after people figured out who he was. The important take-away here is this: If you are concerned about stopping Harper, there has never been a danger in this riding of electing a Conservative.
This continues a long tradition of the Conservative candidate being a non-issue in Toronto-Danforth. Katarina von Koenig, for example, remained a woman of mystery throughout the 2011 election. Andrew Keyes, to his credit, took being a candidate seriously in 2012, at least until Conservative HQ apparently told him to stop participating in debates.