Weren't they asked to come to the surface >_>.... I mean even without a knowledge in Japanese, you can see that if you look at the dialogue that it's something along those lines since they do talk before they come up to the surface and they get picked up by the group later, no offense XP.
"I've just remembered something...He was not as naive as you are. That's what made him a hero." Zero from RMZ
Well, as instantly as it's possible for Masaki to get anywhere. How early did he have to leave La Gias to get there on time?
Masaki same as Zoro from one piece, don't know his left from his right yet he always arrive at right time...
...Some say that they can bend time and space to arrive at any place they want: -like go right to arrive at base on left side -or like go after Shu only to lost your way to find yourself in another world(ACE) (joke)
On a similar note, how did the other Masoukishin arrive? I know Masaki can go between worlds at will due to the power of Cybuster, but the others don't have this power. Did they use the same method the Steel Dragon troops were sent back to Earth at the end of the EX routes?