You would be surprised if Phoenix could get a better package than Caron and Kampfer? Trading your leading scorer for two healthy scratches on most nights? Yeah I think they could do much better at the deadline with many teams bidding for Whitney's services.
Both of these guys have little to no value in any big trade, the best you can hope for is to swap them to another team for a player or two in the same boat with the other organization.
The only way we get a top 6 forward is if we deal Thomas for one, in that case you also have to be ready for the fan backlash and more importantly to pay Rask. Rask I've actually been pretty impressed with this year, I think he's ready, then again goaltenders can be pretty fickle in terms of results. There are a lot more goalies that have 1-2 good seasons, show promise, and then washout of the league. The fact that Thomas has been able to forge quite a stellar career (starting it very late in the NHL) shouldn't be overlooked either.
I think other than beefing up the 3rd-4th lines and a 5th d-man we should be fine. Although, Horton's injury is very concerning.