The "leader& #39;s courtesy" has traditionally applied to leaders running for a seat in the House of Commons in a riding previously occupied by the party they lead. It does not apply to seats in which a new leader is running that was previously represented by a different party.

If the Greens are expecting a "leader& #39;s courtesy" for their new leader Annamie Paul, it would be a reasonable request if one of their three MPs resigned to make way for Paul.

Requesting it from the Liberals in a Liberal seat would be completely out of step with the convention. Requesting it of the NDP is another matter, since it isn& #39;t an NDP seat to begin with.

The notion of the NDP not putting up a candidate against Paul in Toronto Centre is really a political one, not one based on Canadian convention. I wrote about this back when the Greens signaled they wouldn& #39;t run against Singh in Burnaby South: https://www.cbc.ca/news/politics/grenier-singh-byelection-1.4742487">https://www.cbc.ca/news/poli...

As I wrote about in that piece, the convention is very inconsistently applied and is even murkier when it comes to leaders that aren& #39;t prime ministers or parties that form the official opposition.