I think Verge Rangers sucks but even more so in a Landfall deck where you expect to be ahead on lands most of the time. I love Knight of the White Orchid though
Wurmcoil Engine
This card is really really good... but how egregious is it in practice? If I do want to give Welder stuff a final shot I may have to grasp the nettle at some point
I honestly think people are so used to Boros being a weak/shallow guild that it's hard to recognize a great Boros card when it comes along (more charitably, most Cubes are already glutted on CMC 4 curve-toppers for WR Aggro so the competition is tougher than it needs to be)
Kiki/Twin is miserable to play against and not that interesting to draft either. It milks the nostalgia people have for Twin in Modern but wouldn't make it on its own merits for most Cubes