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Originally Posted by Cherie

yeah I get all that, but that 99,000 was also there when the twins walked in, and there are 2 of them so I don't understand why Dexter is the only villian, the twins went low also, and left at least 2 amounts on the board that the 2 remaining should in theory have taken (thereby making them the lowest) so are they not more culpable than Dexter as they actually left it open to the two following to pick higher amounts than them?

The twins had 2 people to go after them and one of them was Dexter, who most of the HM's didn't trust. They had no way of knowing what either he or Charlie would pick.
When Dexter came in there were at least 2 amounts higher than the twins still on the board. He had a choice of 99k and 98,225 that we know of. If he had picked the higher number, and Charlie had picked the lower, or vice versa, the twins would have been the lowest (and Joe desperately wanted to go that week.)
Being so close to Charlie, it's almost certain he knew that Charlie wouldn't want to walk with the money and would pick one of the highest amounts. He picked an amount in the 80's, which no one else had done and would assure him of the lowest. Guilty as charged. Case closed.