You're generally limited to two ejections barring any disqualifying health issues. The military doesn't like to throw away its personnel investments when they've gained some hard won experience.
Agreed. It only takes one of them to have an issue or be out of position. Like you say, it’ll be interesting to see what they come back with after a thorough investigation.
They impart significant g forces (~15g) in line with the spine. Compression fractures are common, and most people permanently lose height as a result of the event. The goal is to provide a result better than death.