They are moving again? They wern't in T2 long, maybe they didnt like it. Next thing you know they will end up being back in T1 because T3 is too small.
When FR first came back (with no based units) they were offered preferable fees by MAG to use T2 in the quiet period (early evening). Now we have based aircraft they aren't getting those rates anymore and aren't happy with taxi times to and from T2, especially around the C pier bottle neck in the morning hence the move to T3.