I need to find out by myself first
What I meant is that people with sol would unlock a dmg tier3 soul first rather than using andromeda.
Sol + andro should be fine for any solo content, just people usually don't have both under rank50.
If you are able to unlock 2 legendary, the rank and power should be high enough anyway.
Well, don't forget the revival skill from Andro, which can save your ass even one of your team gets nuked. I don't think sieg would do a better job than Andro.
I have andro... because I don't have sol ... I hope she alone could solve it.