I think you are confusing the contracts DCE signed. The 8 year contract worth over a million per year was signed in 2015 when he was 26 years old. The contract Watmough is going on about was the money DCE demanded back in 2011-2 after his first season when he was on about $150,000 a year. They upgraded it, but I don't think it was more than $500,000, similar to Foran, which he accepted. He said he wanted to be paid what he was worth and he was happy with that upgrade. Watmough took exception to his demands. DCE was complaining that he was a top tier half back on a rookie's pay packet, which seems quite reasonable to me.
Ponga actually left the Cowboys after his first season, when he was probably on a rookie's wage, because Newcastle asked a lot more than Nth Queensland were prepared to offer, that being $600,000 a year. Was Ponga castigated for taking the money another club offered because his club didn't come up with a comparable offer. No different and perhaps Ponga got a better outcome, because he also wanted to be paid what he felt he was worth, despite not having achieved by that time anything like what DCE had achieved