Because we told you when Jacopo’s group of Reapers were revealed that, for the Players, all Reapers were the same. And it’s true—his group could have just as easily had the other one’s job. One was not “more good” than the other. And if I only gave you a name from the other group, that would have been going against that rule. So we picked from a hat to make it fair between the remaining ones.

As for why, when Chuuya and Caren successfully pulled off their erasure, they wanted that as a reward: for a trustworthy Player to receive the information.