Haven't read all of your many comments on the subject (I work for a living) but what's clear from those I have read is your refusal to consider that those voting against rezoning could be motivated by anything but bias. 

As to what constitutes evidence, I regret to disappoint you; I do indeed have a reasonable grasp of the rules of evidence in Canada's courts. The mayor's comments fall into the category of hearsay. Without corroboration, they have no probative value. Similarly, any testimony regarding the activities of an advocacy group would be rejected absent proof as to its actual - not speculative - impact on voters. Unless you plan to abrogate the sanctity of the ballot box and force voters to testify why they voted the way they did, I see little possibility of your challenge making it to trial - let alone prevailing on its merits.