Pillar will be 27 next year coming off of what will most likely be the best year of his career. His two biggest assets- defense and baserunning really can't be expected to improve next year. He had a great year, but will most likely end up being a bit of an outlier.
Carrasco essentially silenced all the skeptics this year by breaking out in a huge way- making 30 starts, increasing his K% and SwStr% blah blah. The argument that he was s***** before while pumping Pillar's tires isn't really fair because Pillar was pretty s***** too. The difference is Carrasco repeated his success and I don't think many if any MLB orgs would expect Pillar to do the same.
If Sanchez was a guy they coveted enough as a reclamation project to attempt to transition him to starting again, a deal would've probably got done in July. My guess is Cleveland sees the same player many of us see- a guy with one good pitch, lacking a secondary one with troubles throwing strikes for more than one inning. It's fun to speculate what Sanchez could be, but I doubt the Indians are interested in getting lottery tickets back for Carrasco.
As for Greene and SRF they're nice pieces, but not really the blue chippers that return a top of the rotation arm. They could very well make big strides next year and become coveted arms (SRF lowering those walks, Greene striking out more polished hitters). Basically, there would be a lot of teams that would offer more than what is being discussed.