Haleivi- In today’s Hebrew, indeed, ‘motzetz’ means sucking and usually it means by mouth. However, did it mean the same in the gemoro’s time?
Iced- that the teimanim and sefardim to ‘metzitzah be’peh’ TODAY does not prove that they did it always.
As far as the ARi goes- you surprised me with your mention that his father was an Ashkenazi. In egypt?? and what do you mean that he ‘was an ashkenazi”. I’d be very surprised to hear that he followed the Rosh and the Tur, rather than the Rif and the Rambam. Or that he followed the remo, rather than the Bais josef.