He didn't take the ship because the full report of everything that happened, how he let everything slip through his fingers how he was fooled, would have gotten him demoted to janitor.
Or is that just something he made up (albeit true.) to explain his act of charity to his thuggy subordinate?
He was graceful in defeat.
If he had won would he have visited Janeway in prison?
"Your only way out of here Kathryn is if you marry me."