Ahmadiya Aqeeda
Please refer to the following response by Ghamidi Sahab in this regard: Discussion 4209 • Reply 4656
Claim of someone receiving divine revelation (mukhatiba-e-ilahi) is something which questions superiority of Quran. However, calling someone hujjat based on mere interpretation of Quran and Sunnah doesn’t fall in this category e.g. calling someone hujjat-e-Islam or hujjat-e-Quran, which are very common terminologies in our society and requires a different form of critique.