Corrected entry: They exchange Scylla for the life of the general's daughter. If they counted on him valuing his daughter over Scylla, which he did, they wouldn't have had to steal the cards or break into the vault in the first place. Just kidnap the daughter like they did, tell the general to gather the cardholders and hand over the cards, give them Scylla and let them out.
Corrected entry: At the end of the episode, Michael's sleeves are rolled up and his tattoos have miraculously disappeared.
Correction: He has his tattoos removed in the second episode of season 4.
Correction: Michael or the other guys didn't knew that Lisa was General's daughter. When Gretchen failed to steal General's card then she gave Michael the information that Lisa is General's daughter. If Gretchen succeed than they wouldn't need the General to come down or met him. They would just take Scylla and would return using the same path they got in.