1)
What do we learn from "Gam Ko'ach Yedeihem Lamah Li"?
1.
Rashi: They were Resha'im - what benefit is there from them? Punishments come via them!
2.
Malbim: Even though they were young and strong, I did not want them to guard my flocks.
2)
What is "Kalach"?
1.
Rashi: Old age. Ibn Ezra - initially they were pained over the loss of their moisture. They did not know when they will age.
2.
Malbim: It is moisture.
