I know its a controversial topic but the other day an Australian guy asked me about it and I could not answer.
What is the fundamental difference between Sunni and Ahmedi CONCEPTS?
The difference is Ahmadis believe Messiah/Mehdi/ISA has arrived while rest are still waiting for him/them.
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Apart from the controversial status of Khatam-e-Nabuwat, if there isn't much of a difference, why is there a need for anther prophet or messiah?
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Should ask Allah this question who decided there will be a prophet in later days. But apparently religion would be in such dire state that nothing less than a prophet can correct it.