I must say that no one in the Ummah can be more guided then the Four Rightly Guided Caliphs.
Now Syedna Abu Bakr launched a campaign against the imposter who claimed to be Nabi after the demise of Prophet Mohammad (PBUH).. so if there was a hint of new prophet, then these Rightly guided Caliphs might have accepted them or atleast should have given them a chance to prove their claim.
But we didn't see any thing of this sort, even in the middle ages, there were several imposters claiming to be the prophets but none of them was acknowledged by the Ulemas of that time and were considered Dajaal and Fitna...
So how come this person can be a Prophet.. the discussion of Nabi and Rasool is thing of later stage...
May be you have misinterpreted me... I was not making an argument for or against Qadianiat... I was only narrating an argument presented by Qadianis & its refutation by the Ulema...