McMann really underestimated Vieras physicality and ability to wrestle with her, I think. Viera (on paper) is a very good wrestler in her own right, and she seems to be better at fighting through things.
Depends on which PVZ shows up, in my opinion. PVZ has been playing rangey kickboxer, but at that range Jessy Jess is a better striker I think, and probably the hardest puncher PVZ has faced. Jessy should have a strength advantage in the clinch, and I would assume her once poor wrestling game is being fixed at syndicate.
Speaking of camps.. PVZ is not at a well known camp anymore, which might help or hurt, we will see. I do think her lack of a combat sports background hurt her at alpha male.
Swarming Clinch & Volume PVZ might have a chance, as I don't think Jessy can make PVZ pay for running in, and she has been ground out before. Again though, Clark was able to compete somewhat physically with Janay Harding, Pam Sorensen and Pannie Kianzad. All of whom have or do fight at 145. I'm not sure PVZ has that strength (or the technique) to bully Clark. As for volume, Clark has never had a bad gas tank, though it's nothing remarkable either.
PVZ isn't a great fit for Flyweight in my opinion either, she wasn't sluggish or chinny at 115, symptoms of poor weight cuts. And against Rose & Waterson she got outmuscled, so it isn't like she was a huge strong 115er.