Board Thread:Questions and Answers/@comment-71.126.134.179-20130124195154/@comment-77.208.112.214-20130223213124

What happened is that Ikki burned his cosmos so SO hard that they were in a similar state that Hyoga inside the Another Dimension. But the two men survived, that was a feat, and Shaka by himself could have returned alone perfectly, but he needed one helpful hand in psychokynesis to bring one man from that dimension (A dimension whose space and laws were far away related from this world) or in other words, he needed Mu to bring Ikki back, so it was just that, Ikki burned his cosmos so high (higher than Shaka himself) that they were to another plane of existance.

Yes, Ikki were so badass that could do that feat