Klitschko would absolutely pummel Ike for most of the fight. He's custom made-for Wlad: smaller, leaky defence, slow feet and slow punches. Wladimir's usual jab and grab game would be perfect against Ibeabuchi. The only real question mark is whether Ike could somehow put on enough pressure to empty Wlad's gas tank and do a Puritty on him. He might against a younger Wlad but under Steward Wlad I think he is SOL. I think he'd eat a jab buffet all night and in the late rounds Wlad's thunderous straight right might even end it for him, Ike's great chin notwithstanding.
Vlad takes him apart. Ike is damn near as overrated as Golota is. He was talented but very flawed. He had two very good wins over Byrd and Tua but neither of those guys were on Vlad's level either.
Wladimir Klitschko by UD spamming his jab and his right hand. Ike have a good chin he can't be knocked out by Wladimir Klitschko but he will not touched him I think significantly like a David Haye.
If I would bet, I'd go with Ike. Couple reasons, when he went to prison and ended his career Curtis Cokes was extremely heartbroken. When your trainer is a former champ and believes in you that much that counts for a lot in my book. Also, the first Brewster fight, Ike would be relentless and wear Wlad down, and mid rounds ko. Finally, Ike was a nutcase, he is like a human Pitbull, you better knock him out cold or kill him or he is going to kill you. Example the Ezra Sellers sparring story. Too bad he couldn't contain the crazy behavior to the boxing ring.
A guy who never beat a high quality puncher fighting an excellent puncher/swarmer against a guy who never fought a high quality normal-sized heavy fighting one of the biggest and most skilled. Flip a coin. There is no way of knowing.