Trout's Agent is worried he's going to be fired and replaced by some other Agent before he gets commission on Trout's big money contracts.
As was mentioned by some others, luxury tax is based on the average annual value of contracts of players on the team. Cash compensation paid in trades also counts against the luuxry tax. That means 2/3rds of Vernon Wells' salary coutns against the Angels for luxury tax purposes. The Angels are actually *just* under the tax cutoff.
Since there are serious penalties for going over multiple consecutive years, what will likely happen is they will sign Trout to a long contract after the 2014 season. That's when Vernon Wells money goes off the books. And in that case, they'd actually be better off signing him to a very long term (like 15 years) deal, with a huge lump sum paid in year one. Average annual value would be low but a huge payoff up front (like $40m or more ) would be hard to refuse compared to arbitration.