Sample sizes are small at this point. Filppula isn't going to end up with the 75 points he is on pace for...nor is Weiss going to end up with the 14 points he is on pace for...things will normalize over the course of a long season.
So your logic is that Weiss is new to his team so his production will improve while Filppula, since he is new to his team, is producing at higher than normal levels?
If you have ever played higher level hockey you would understand going to a different team and learning the style of play is not always easy, you end up bringing bad habits from your previous team. Your comparing Flip who was here 7 years to Weiss who was here 11 games.
Why didn't Filppula need an adjustment period going to Tampa?