Pvp squad position

Hey I had a question for PvP. when you are just playing, which squad will be the 1 PVPing for you when another team encounters you? Is it squad 1 or the squad that you are currently playing with?

I think its the first line of the squad you have selected, but I'm not 100%, I've never given muc thought to who they fought since it doest affect anything.

I have noticed they do a combination for the pvp battles between all 3 of your squads. For example someone told me they faced my 2 queens and 2 mutants when they are in my 1st squad but in the backrow due to leveling up the event elites during the raid event. I also have faced my allies in battles and the battle I face is not their current squad they are using on the map it was a different squad. So I have yet to figure out how FF does the battles matches.

On a smaller lvl it does have some effect. For example, even though im a big fan of everyone on this forum and the help that is so generously given, it is still a game...competition based and though there arent any tangible stats how well your opponents are doing have value quantified against how you are doing, which become even more weighted in pvp matches. You wont actually see it for yourself but but if havinh my strongest defensive team show up in your pvp battle choices may mean you dont get the 3 win streak that go round and if you happen the be on the cusp or a run where the rewards for keeping your streak alive include an increase in the ammo mags you would win in doing so then to have a lesser team of mine show up to fight and you win means i just unknowingly gave you another ammo mag advantage over myself. That being said ive faced my alt (which is really oddly awesome for some reason, lol) on 3 seperate occassions and it seemed to me it cherry picked the best stats members from my 1st squad (both the active and reserves). It seems that might be the formula it follows as i seem to face a fair amount of incomplete squads and given the amount it would just seemstrange to me that that many people would have all 3 squads sitting incomplete at any given time. Just my theory though