Synchronization THEN overall skill. Synchronization only used when something special is added to the I.S. and Synchronization affect it greatly (such as Image Interface Weapon). Meanwhile, great skill allows the user to maximize the potential of the unit itself, resulting a lot of precious data in process.
@ Eras
Dunno, no plan for that. But most probably yes, after Charles and Laura of course.
Also, lol at random event