I guess that satisfies the title, Alix, but you're being a bit shrewd about it. Jorge may be listed MIA, but in actuality, he's KIA. There are an innumerable amount of Vietnam War soldiers who are still MIA, even though they really died in 'Nam. The point is, Jorge is dead, regardless of his classification.
Califlour, you're making the incorrect assumption that every Slipspace rupture has another end. The fact of the matter is, to enter Slipspace intact, you need a controlled rupture, and to leave Slipspace, you need a second rupture. Otherwise, you'll end up blown to oblivion, at best, or alternatively spend the rest of your life trapped in the void, assuming you reached Slipspace intact in a vessel that can maintain integrity in the stream. Even if it were a controlled rupture leading into subspace, the ship he was on was physically compromised. Further, his armor was so compromised.
You say Noble survived 90 million Roentgens, but they were exposed for a brief instant, before they had their radiation-sealed armor on. Second, Kat was measuring ionization of the air in Roentgens, not the causal radiation; Covenant energy projectors aren't stated to emit ionizing radiation, but the amount of energy released can ionize air. Even then, Slipspace produces radiation on the level of billions upon billions of Roentgens, if the sheer amount of lead lining in canon Slipspace craft is anything to go by.
Even still, under the best conditions, Jorge could not have survived for long. And, considering the nature of the rupture, he would have been blasted to oblivion before he saw the flash.
The mistake you're making, with regards to Master Chief, is he didn't survive a Slipspace rupture, nor did he survive any notable time in Slipspace. The Ark Portal closed midway through the Forward Unto Dawn's entrance into it, splitting the ship where the rupture closed as the back half got pulled onto a secondary filament inside the rupture, and ejected, likely nanoseconds later. (A truly massive distance crossed, by Forerunner Slipspace technology)
He then proceeded into the cryostasis bay of a human ship, designed for human anatomy and human operators, and initiated stasis under the assistance of a smart AI construct.
Even if Corvettes have cryostasis capabilities, and he somehow survived a slipspace drive rupturing space itself, and then exploding as it overloaded (That, alone, would have killed him), he wouldn't have known where to find them, how to operate them, and they likely wouldn't have worked very well with his very-different physiology.
Can we please let a hero rest?