Rakim is easily the most important and influential rapper in the evolution of the technical aspect of rhyming. However, it's just as obvious that he has been surpassed in the rhyming department by many rappers who have already been mentioned in this thread.
Follow procedures, the crowd couldn't wait to see this
Nobody been this long awaited since Jesus
Who wouldn't believe this - I heard the word on the street is
I'm still one of the deepest on the mic since Adidas
They said I changed the times from the rhymes that I thought of
So I made some more to put the New World in Order
with Mathematics, put your status above the average
And help you rappers, make paragraphs with graphics
Cause new days is dawnin, new ways of peformin
Brainstormin, I write and watch the night turn to mornin
On and on and, I got the whole world respondin
Rock, I keep it hot and blow the spot without warnin
The Emperor, well known for, inventin a sentence
full of adventure, turnin up the temperature
Rush with adrenaline, how long has it been again
to be in the state of mind that Rakim is in?
This kind of verse is nice but it's also kind of predictable. What Nas improved over Rakim's style on Illmatic is that he used way more internal rhymes, making the rhyme scheme as a whole more intricate and less predictable and boring. Also, Rakim always kept that old school flow which was dope when he came out but it's just kind of outdated now compared to Nas' flow for example. Rakim's songs are still classic though..
No one does internal rhyming like Ra(he brought it to Hip Hop on a Grand scale) not even Nas.
This is boring to U?? His flow was sick on this. From the same album.
Just when things seemed the same, and the whole scene is lame
I come and reign with the unexplained for the brains 'til things change
They strain to sling slang, I'm trained to bring game
History that I arranged been regained by King James
Go to practice, with tactics, when the track hits, theatrics
Women that look like actress the status of Cleopatra's
Stacks of mathematics to feed yo-asiatics
As I find out, what the facts is, for geographic
No time to sip Mo's with hostess, never mind what the total gross is
I rip shows, stay focused, and split cheese, with soldiers
While you hit trees and coast I spit flows that be ferocious
And with these explosives, I split seas for Moses
Shine permanently only my mind's concernin me
Fire burns in me eternally time's eternity
Followers turn on me they'll be in a mental infirmary
Determinely advance technology better than Germany
Since the first days you know of, till the last days is over
I was always the flow-er, I made waves for Noah
From a compound, to the anatomy, to the breakdown of a atom
Some of my rap patterns, still surround Saturn
From the ancient hieroglyphics, to graffiti painted pictures
I study I know the scriptures but nowaday ain't it vicious
Date back I go beyond, check the holy Qu'ran
To speeches at the autobahn, now we get our party on
So being benificent, I bless em with dialogue
They expectin the next testament, by the God
I roam through battlezones with chrome for chaperone
Blast beat with saxophones one of the baddest rappers known
Every country city and borough, sidestreet and ghetto
Isle and alley and meadow, theories thorough enough to echo
When it was one mass of land, with one nash' of man
And the whole mass was ran under one master plan
Since the world's metamorphis, and the plan is kept in orbit
Turntables we spin awkward but needles never skip off it
Rhythms we expressin similar to our ancestors
It'll answer your questions if you understand the message
From the days of the slave choppers, to the new age of prophets
As heavy as hip-hop is I'm always ready to drop it
From the mind which is one of Allah's best designs
And mines'll stand the test of time, when I rhyme
When it comes to the trio of Lyrics/Flow/Rhyme Scheme no one in the history of Hip Hop is seeing Ra. Nas didn't update sh1t from Ra. Niccas still haven't topped the trifecta of Follow The Leader/Lyrics of Fury/Let the Rhythm Hit em including Ra himself.