I am a M.Sc. graduated from a developing country and I recently got admitted for PhD in one of the reputed universities in Canada (rank 20-30th world-wide), say university A. In fact, because of the compulsory military service I could not exit the country with an M.Sc. admission letter, so I ended up applying for the PhD programs. In general, I am completely happy to do my PhD in A and the university is considered a good place to research, however I thought that by doing research with great scientists there and completing a M.Sc. degree I probably would have a better chance of getting a PhD admission from a better university (e.g. a top-10 place), say university B. As I have an interest to work as faculty in future, studying in B may slightly increase my chance for my future carrier. So, I would like to know is it anything bad or immoral to express my idea to my potential advisor when I arrived in Canada? Please note that I would be perfectly happy to work as a PhD student under his supervision in case that he is unwilling of the downgrade but I fear that the proposal in itself burns the bridges or implies that I have not interested in doing research with him. All in all, I would like to know that what is the best (safest) way to express my desire to my advisor?
P.S: regarding the university policy, I checked and the university accept it if the advisor agrees.