It's a bit like people who resign. They have broken their emotional attachment to the company. Why try and talk them out of it? They have more than likely gone for a couple of interviews but decided well before getting that 1st interview, to look elsewhere.
Now that it is official, there are no emotional ties, he has received his $$$'s he is now happy so, the Tigers receive nothing (except a win perhaps) in playing him (or Ayshford).
If they get the all clear regarding Brooks, play him and Siro at 6 & 7. It not, it has to be Anasta & Siro.
It cannot be Brooks and Marshall, what would be the point.