The real question: Were those Christians in the first century claiming to be the sole representative of God, and claiming divine inspiration in their prophecy? Were those Christians saying, in effect, "This is what Jehovah has told me."
Another question regarding the "partial prophecy" of 1 Cor 13:9-10: Is any part of what they are prophesying failing to come true? I can say for a certain the sun WILL come up tomorrow, but if I say "It is going to rise at 2:00am in Modesto California, Jehovah told me so" then I am wrong, and that is a false prophesy.
In the first instance, I have not said anything wrong, but it also does not reveal the all of the information because I do not know at what time the sun will come up, nor am I going to run around telling everyone at midnight that it is going to come up REALLY SOON!
Partial prophesy will not at any time be wiped out, or changed, by further understanding. False prophesy will be shown to have failed.
Saying that the likes of Abraham, Isaac, and Jacob will be ressurected in 1925 can be shown directly to be false. Saying that Gods kingdom will come on earth in 1914 (not in heaven as they would have you believe now) did not happen, and is therefore false.
By placing direct, measurable, statements we can confirm that what they said did not come to pass. Therefore, they are false prophets.