Got it so it seems that $9k is taxable because the money you're withdrawing from the losing account is bonus $.
Only $6.3k is taxable, as you will have bet winnings of $3k on one sports book depending on which bet wins, and $3.3k bonus on Ceasers.
It's possible that if you itemize deductions you can deduct the $3k that you lost against the $3.3k bonus, but that depends whether the bonus is classified as gambling winnings or as misc. income.