1)
What will be for you alone?
1.
Rashi: You will be honored [for your teachings]; no one will share the honor with you. Above, it said "strangers will be satiated with your Ko'ach" (10); here, it is only for you.
2.
Malbim: Even though your Chachmah will spread outside, the teachings will be said in your name. Also the reward of Chachmah is only for you.
2)
Why does it add "v'Ein l'Zarim Itach"?
1.
Malbim: Even though your Talmidim who spread your Chachmah, also they have reward with you, they are not considered Zarim (strangers); they are like your children.
