I loved this chapter <3 when mashima explains things I feel better XD
I think too that DKfestival happened 400year ago will be "transported" in the present and maybe the lucy we know is going to come back with the same portal (maybe in the scene when she's crying?!?! maybe she will lost an arm because she tries to use a magic portal that, already used for a lot of dragon, cannot "transport" her completely? that would be a little scabrous to be transported with an arm less though XD)
Anyway there are two possibilities now:
1 .that the capture is only part of the plan for capturing Lucy to activate the gate in the last day, when the FT members will be too busy to fight in the tournament in order to save lucy instead of saving her personally (Arcadios said that he wanted to use a new method to capture her few chapters ago)
2. that the minister want to relegate the two celestial wizards in order to not activate the gate.
I think we can only bet on this two options for now because we have clues from both sides :)
And now let me daydreaming:
It could be possible that lucy's mom was used for a past eclipse plan and that she died for fatigue later. And if in the Layla eclipse plan Natsu and other DS was transported 400 yeard in the future? That would explain the ds age problem, the fact that zeref knows a baby natsu, maybe even why dragons know why DKfestival in going to happen "again" in the present (bacause as I said before, DKfestival happened 400year ago will be "transported" in the present) because maybe they arranged this with humans (!?!).
just a theory :) Bad english, hope you're going to understand XD