Samsonov had 3 years under his belt before coming here and during that time, his numbers weren't great, however they were better than Murray's numbers during those same three years. Samsonov was also highly touted at one point so high pedigree in that regard whereas Murray had previous playoff successes as we all know but at the same time, that was many years ago and since then he hasn't been great. So bottom line, both had the potential to be very good, but both had question marks attached. With all that context, I'm pretty sure Dubas thought Murray had potential to be "the guy", but also thought the same about Sammy.
I believe Woll has to be with the Leafs next season or go on waivers. Sammy has outplayed Murray and Woll has looked great so unless something drastically changes, it's Woll and Sammy next season. Murray will either be dumped, or if dumping him is too costly they could start the season with 3 goalies, and hope Murray plays well and can be dumped at some point during the season without it costing too much.
Hopefully Murray can play soon, it's not impossible that ups his value before the season is over.