Is this the first time someone predicted an eclipse to intimidate people since Columbus did it in 1504? Could be. Good to see this hoary literary device has some basis in reality.
Moreover, many of the leaders he dealt with ruled only villages, not whole tribes. Getting the support of one band of Indians didn't necessarily mean the neighboring bands would agree.
He understood that Native American peoples were in a particular historical predicament, and he was articulating that predicament, and was doing it for all of them.
An equivalent today might be a Native intellectual arguing that mascots and other stereotypes harm Indians. It doesn't matter if some Indians (and many non-Indians) don't get it. The facts and evidence prove this argument to be true whether people get it or not.
For more on the subject, see War Footing in Tecumseh's Vision and Review of Tecumseh's Vision.
Below: Tenskwatawa by Charles Bird King.