1) When does a unit add their Edge(X) to the final result of the Edge battle?
Rulebook, pg 25:
" The “Edge” keyword is always followed by a value. This value is the number of additional Force icons the card’s controller counts in an edge battle resolved during an engagement in which the card with the “Edge” keyword participates."
From the wording of Egde(X) in the rulebook, it's clear that the unit itself must still be participating in the engagement.
So a Heat of Battle on a Snowspeeder when you have two Snowspeeder Operations in play will eliminate their 2 additional Force Icons.
But what if the unit still participates but their edge (x) condition has been eliminated (or triggered)?
Say I attack with committed Reserve Troopers and have two Security Checkpoint ("Each unit you control that is committed to the Force gains Edge(1)") in play. My opponent plays Echoes of the Force in their Edge Stack and uses it to remove the Trooper 's commitment. Do they add their 2 Force icons to the Edge Stack before the Fate Cards trigger or After?
My reading of the "Egde(X)" rule would be the troopers loose their Egde because the Edge battle only resolves after all Fate cards have been resolved. And logically, you can only add the Force Icons after you have something (i.e. a resolved Edge battle) to add.
2) Can Virago steal the Elite keyword when it is relevant?
" Action : Pay 1 [scum and Villainy] resource to have a target enemy unit lose a keyword until the end of the phase. Then, this unit gains that keyword until the end of the phase."
The Elite keyword is only relevant in the Refresh phase, So stealing an opponent's Elite at the beginning of that phase would be quite useful (either because a double-focused Elite unit cannot remove both focus tokens, or because Virago is double focused). However, since there is no action phase before the actual "remove focus tokens" step, it won't be possible to trigger Virago 's action at the right moment.
3) Buried Outpost and Hoth Scout
Can I sacrifice my Hoth Scout to avoid 1 focus token from being placed on my Buried Outpost (" Forced Reaction: After this enhancement enters play, sacrifice a unit or place 1 focus token on this enhancement. ") , and use that sacrifice to place a Shield (" Action : Sacrifice this unit to place 1 shield on a target unit or objective.")?