I wouldn't be surprised if he sold his stake in MASN or sold MASN's rights to the Nats to Ted and then separately tried to find an independent RSN for the Os (of course 10 years too late to really make money from the deal)
from some of the links above, I think I saw that MASN has negative value at this point. It may be due to the rights fees and judgments. He could give Ted MASN for $1, but for it to work, there'd need to be a negotiation on the rights fees down to a more sustainable level.
Funny thing is, the right set up for Rubenstein would be to have the profit in MASN and not the team, but for the Lerners, I think the rights fee exceeds their MASN losses.