Without seeing how many other severely short stacks were left, I'm guessing you probably still could have squeezed into the money. The bottom line, though, is only you can decide whether it's more important to do that, or to keep trying to accumulate chips. That said, K6 is a good push from the CO. You're ahead of their 3 random hands, and even a better king may not be risking 1/4-1/3 of his remaining stack so close to the bubble.