Ur statement is false or else wrestlers would be dominating mma. There have been elite strikers who have walked through elite wrestlers like nothing. Such as Anderson Silva, CroCop, Lyoto Machida. Plus unlike anderson silva, aldo has shown that he potentially has great take down defence.
a. It's already been pointed out by MC (+ rep) that wrestlers DO dominate MMA. Lets see:
HW - Champ Lesnar (wrestler), top contenders - Carwin (wrestler), Velasquez (wrestler). Previous champs - Couture (wrestler), Randelman (wrestler), Coleman (wrestler).
LHW - top contenders - Bader (wrestler), Bones (wrestler), Rashad (wrestler), Previous longest reigning champs Liddell (wrestler/brawler), Couture (wrestler) and Ortiz (wrestler)
MW - top contenders - Sonnen (wrestler), Hendo (wrestler). There really are no other wrestlers in the div, otherwise there'd be more of them at the top, and this again is the reason Anderson dominates so easily.
WW - Champ GSP (late bloomed wrestler), top contenders - Koscheck (wrestler), Fitch (wrestler), Jake Shields (wrestler/submission hybrid). Previous longest reigning champ Hughes (wrestler).
LW - Champ Edgar (wrestler), top contenders Maynard (wrestler), Melendez (wrestler). Previous champ Pulver (wrestler).
b. What wrestlers have Anderson and CroCop "walked through"? Do you mean the one that destroyed Anderson for 4.5 rounds? Or the only guy that won a round on him until he decided to stand with Anderson like a fool. And CroCop? I hope you're not referring to "professional wrestler" Josh Barnett, because Mirko has never faced a real wrestler in his career.
Machida is the only one on your list that made sense, but Aldo fights nothing like Machida. Machida has a cautious, elusive, counterfighting Karate style, whereas Aldo has an agressive, flashy Muay Thai style that makes him tailormade for a good wrestler.
The only guy close to a wrestler that Aldo has faced has been Mike Thomas Brown, and his highest achievement has been winning a High School State championship ... that's like winning the Pee Wee leagues compared to the like of NCAA div-I All American and 8th Ranked Maynard. Anyone can have good TDD against mediocre takedowns ... I'll believe when I see him fend off an NCAA level wrestler.