First up is Mike Ricigliano who was a very frequent contributor to CRACKED throughout the 80's and 90's. Their own imitation Aragones; he even drew little cartoons for the page borders. Now he does a lot of sports cartoons.
Next up is John Severin, who undoubtedly was the backbone of CRACKED. I don't have exact data, but I'd guess 10 to 20 percent of ALL CRACKED material was done singlehandedly by him. And would you believe he did side work for other publishers as well? Truly a comic art legend.