Ike had a lot of promise, going toe to toe with Tua suggests he was near impossible to KO and his KO of Byrd showed he had one shot power and was relentless. Combine that with a good jab, high work rate and combination punching he was a formidable package. But he never faced a super heavy the size of Wlad or Vitali. He'd be very competitive and be an especially dangerous fight for Wlad due to his power, work rate and strength which would prevent him being clinched. I'd favour Ike over the current Wlad and it would be 50/50 prime for prime, Ibeabuchi had the skills to be a night mare for him. Vitali I'd favour to beat him. Just as durable, high work rate to match Ibeabuchi's and the size and movement to win on points.
In my opinion Ike Ibeabuchi would have defeated both Klitschkos by knockout. In my opinion he would have defeated Lennox Lewis as well and I mean prime Lewis. Ike was everything Evander Holyfield was but bigger, stronger and hit harder. Had he not gone to jail we may not have suffered the dark ages of the Klitschkos. Anyone who compares him to Samuel Peter is so far out of it.