Act 5 with this team?

_Chaos_

4/40 Ghost Rider (Duped sig 40)
4/40 Corvus (unduped)
4/40 Sparky (unduped)
3/30 Proxima Midnight (unduped)
4/40 Blade (duped low sig level)

UmbertoDelRio

I mean... Just try it out. I wouldn't have been able to get far with that team, I think, but you can still try.
If it doesn't work out just work towards act 4 exploration and do all those sweet ass events.