Re: What if…
Even the most staunch enemies of Mirza Ghulam Ahmad (as) were forced to speak of his contribution to islam. The manner in which Mirza sahib confronted the influx of christianity into subcontinent had no match. Dont take my words for it, listen to it from Dr Israr Ahmad (a very outspoken enemy of ahmadiyyat):
Dr Israr Ahmad Speaking Truth About Hazrat Mirza Ghulam Ahmad Qadiani A.flv - YouTube
Its a stupid argument to say that since majority of muslims believe in something, they must be right. Religion is not a practice ground for democracy. Whenever a prophet comes, he is always in minority.
By the way, nobody answered why a prophet that was sent to Bani Israel would be re-sent to guide muslim ummah.