It's a nice notion, that's for sure. Artists give eachother intros/outros/interludes all the time though.
I really wanna see how far Kendrick gets. I was listening to HiiiPower and Keisha's Song the other day and it really blew my mind how incredibly well crafted both those songs are, and how badly I wish Kendrick delivered stuff on that level all the time.
The City is such an incredible song too, Game and Kendrick mesh so well together. It's this beautiful contrast of styles. The verses Game drops across that song have this impenetrable delivery and go so hard, and then you have Kendrick building up to that fantastic verse-kind-of-thing at the end to close it all out; all over some fantastic production. I don't know how some of y'all couldn't feel that song.