Second R5 5*
I already have 5* R5 Nick Fury at Sig 1. I was wondering what to rank up next. I'm in the process of 100% Act 5 with 5.1 100%, 5.2 need to do all of the collector fights apart from the first one I did, 5.3 halfway 100%, 5.4 100%. I haven't done 6.1.2 yet as sentinel and Ultron there seem bad and I don't have Medusa. What would you all suggest?