^yes^

Krs-One...im not the biggest fan but he can preach
for hours on in and stay on point off the top of his
head and be tolerable unlike canibus

eminem prewrites(same verse was on every mixtape)
big L prewrote...Jay Z prewrote and stoped eventually..
and pretty much freestyled blueprint 1 & 2..thats talent

you gotta think..when your hearing a beat you can
come up with at least three lines to start you off
and have one or two lines stored up in case you
get caught up to reword for your own satisfaction....
at least I do..and I think yall do as well

once again KRS-ONE

honorable mention - mad skillz a.k.a Skillz