"Who knoweth but" what

1. Mosiah 29: 7
     7 And now if there should be another appointed in his stead, behold I fear there would rise contentions among you. And who knoweth but what my son, to whom the kingdom doth belong, should turn to be angry and draw away a part of this people after him, which would cause wars and contentions among you, which would be the cause of shedding much blood and perverting the way of the Lord, yea, and destroy the souls of many people.
2. Alma 37: 10
     10 And who knoweth but what they will be the means of bringing many thousands of them, yea, and also many thousands of our stiffnecked brethren, the Nephites, who are now hardening their hearts in sin and iniquities, to the knowledge of their Redeemer?
3. Alma 46: 27
     27 And now who knoweth but what the remnant of the seed of Joseph, which shall perish as his garment, are those who have dissented from us? Yea, and even it shall be ourselves if we do not stand fast in the faith of Christ.
4. Ether 1: 38
     38 And it came to pass that Jared spake again unto his brother, saying: Go and inquire of the Lord whether he will drive us out of the land, and if he will drive us out of the land, cry unto him whither we shall go. And who knoweth but the Lord will carry us forth into a land which is choice above all the earth? And if it so be, let us be faithful unto the Lord, that we may receive it for our inheritance.