Potential is dangerous territory I don't want to diverge into.
Jimmy Anderson looked rubbish to me, Morkel had the better potential. He had the pace and bounce to thrive in any conditions.
All he had to do was take care of his erratic deliveries. To this very day he is still erratic.
Jimmy goes back to the basics, adds the inswinger into his armour (which is not easy) and becomes a very very good bowler. Jimmy had a higher scope for improvement and he more than fulfilled that. All Morkel had to do was to take care of his lines and lengths and he would have been a faster version of McGrath/Pollock. I really thought he was going to be the next Michael Holding. He didn't come anywhere near to that, not even close. He only needed to be as half as good as those guys in terms of control and failed miserably.
Take Steve Smith for example as well, we all thought he was rubbish and so did the Australians to be fair. Got dropped and went into domestic cricket, his upturn has been nothing short of remarkable. I couldn't have envisaged him batting in the top 4/5, not in a million years.
So who am I to gauge potential? I don't want to be dragged into that TBH, with all due respect.