Was John McCrae gay?

If you don't remember John McCrae, he was the author of In Flander's Fields. This past weekend there was an article out about an Ottawa Museum claiming that John McCrae was gay. What's their evidence? Not much.

Francesco Corsaro, the Bytown Museum’s director of development, said in an interview he knew of multiple, credible sources indicating the famed poet was gay.

“There are some people who believe that he was,” said Corsaro.

Yet the only historian who is named by Corsaro as a source disputes the same-sex story.

Basically the argument seems to be that he was rather sad when a friend of his got blown to bits in an earlier battle. (The news story is sparse on details; filled mostly with contrary assertions by various historians).

Is this what California's new law on the teaching of gay history could lead to in a search to find homosexuals to teach about? (The homosexual population is significantly smaller than most people estimate)