This whole Noah was a preacher of the last days things has me really irked. I just don't see Noah as a preacher, in the sense the society is using it, supported by the Bible.
Here are my thoughts, yes, they're not scholarly, but they represent how I feel. Feel free to comment in agreement or disagreement or possible sharing some more scholarly information.
Genesis 6: 13, 18 and 7:1 clearly show that Jehovah had already chosen Noah and his family. There was no commission to preach because there was no one else that Jehovah planned on saving.
The amount of humans alive before the flood. If the flood happened in 2350BC then that means there was a couple thousand years of individuals having kids. Based on the few families shown in the Bible each one had many many children. The only WT quote I could locate about the population size of the pre-flood world said something like there was likely less people then than now. Well, that's just great! There about 6 billion people now. Even if there were only 1 or 2 million pre-flood people, which does seem rather low, Noah couldn't have possible reached them all, nor would they all had seen his ark project.
2 Peter 2:5 - calls Noah a preacher of righteousness. How did he preach?
Hebrews 11:7 tells us that by his faith he condemned an ancient world. There you have it. He made known his faith in God by following instructions. Not by going to his neighbors homes and trying to convince them to join him.
Matt. 24:36-42 - 36 “Concerning that day and hour nobody knows, neither the angels of the heavens nor the Son, but only the Father. 37 For just as the days of Noah were, so the presence of the Son of man will be. 38 For as they were in those days before the flood, eating and drinking, men marrying and women being given in marriage, until the day that Noah entered into the ark; 39 and they took no note until the flood came and swept them all away, so the presence of the Son of man will be. 40 Then two men will be in the field: one will be taken along and the other be abandoned; 41 two women will be grinding at the hand mill: one will be taken along and the other be abandoned. 42 Keep on the watch, therefore, because YOU do not know on what day YOUR Lord is coming.
I just get the feeling that those preflood individuals did not even know what was going on. They weren't preached to but found unrepentant. God judged them and found them deficient. They were living their normal lives and all of a sudden the flood came.
Anyway comments are welcome.