You really think this guy is gonna be able to contribute at an Eddie House level half way through his rookie year?
Not really, that's just the absolute best-case scenario. Really, what I'm talking about is a scenario where a starter goes down and you can trade for a midseason replacement if you package the contracts of Scal and TA, but you can get someone much better if you have the option of throwing in House's contract as well. If Hudson is proven to be useful as a bench scoring guard, maybe not as good of a shooter but more diverse in his offensive capabilities, then Ainge may feel comfortable knowing that he can afford to part with House if necessary and flip a second-round pick for a vet-minimum guard. Imagine if Pierce goes down with an injury where it's not sure if he can come back in time for the playoffs and having the flexibility to include House in a package allows the team to land someone this forum lusts after, like Nocioni.
I think that if Hudson makes the team and gets playing time beyond the D-League, there's a chance that House won't be back after his current contract runs out. I expect House to regress toward the mean and not shoot as well as last season, so having Hudson also gives the Celtics leverage in any contract negotiations if they want to bring House back, but only on a relatively cheap contract.
It's just a question of if Hudson makes the team. I feel that he's the sort of player who is either able to play in the NBA or not and that will become apparent relatively quickly once he plays against NBA talent. If he can play, I think he will be able to contribute immediately and won't be a project who needs to be sent to the D-League.