Why does the claim persist that prophecy and teaching are one and the same? What is to be gained through that argument? By far the most important argument is that were prophecy to be anything other than teaching, it would constitute additional special revelation on a par with scripture as regards authority. I can understand people being worried about that. Another argument might be that in places where there is definite lack of experience of prophecy, Bible teaching is the closest category available for understanding those passages that speak of prophecy. Another argument might be that when people have seen excess, counterfeit or claims for prophetic revelation that dismiss or claim to go beyond scripture, they are justified in writing the whole thing off because the negative is so damaging. Another argument might be that scripture is by far the normative means of God ruling his Church (correct) and that therefore anything that seems to fall outside that norm is a challenge to God's rule over his Church(logically not necessarily correct).