why do you think that the two excellent movies starring peter cushing are not considered canon (he is usually not included on canon lists- 1st doctor, 2d doctor, etc)?

i think that sean mcgann's (or is it mcCann? i'm too lazy to look it up right now, i'll edit this post if wrong) one off appearance (on film at any rate) is considered canon because sylvester mccoy's appearance ties it to the "offical" doctor storyline.