In Paul's example in Corithians there are a few that speak (prophecy). Is there only one preacher in a local body? Does it have to be a preacher to prophecy?
Romans 14:
How is it then, brethren?
when ye come together,
every one of you hath a psalm, hath a doctrine, hath a tongue, hath a revelation, hath an interpretation. Let all things be done unto edifying.
1Cr 14:27 If any man speak in an [unknown] tongue, [let it be] by two, or at the most [by] three, and [that] by course; and let one interpret.
1Cr 14:28 But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God.
1Cr 14:29
Let the prophets speak two or three, and let the other judge.
1Cr 14:30 If [any thing] be revealed to another that sitteth by, let the first hold his peace.
1Cr 14:31 For ye may all prophesy one by one, that all may learn, and all may be comforted.
1Cr 14:32 And the spirits of the prophets are subject to the prophets.
1Cr 14:33 For God is not [the author] of confusion, but of peace, as in all churches of the saints.