Some people are unaware that in 10.1 the entire way of gear upgrades is changing in the game.
Here is a pretty good overall spreadsheet by Soul Breezy that currently explains pretty well how gear is going to be upgraded in 10.1.
Remember, Valor is going away. All Gear from all sources of content (except pvp) are upgradeable to a certain rank with Flightstones (universal currency) & 4 types of Crests (Content level dependent, ie LFR, Normal, Heroic, Mythic).
Soul’s video on the subject does a pretty good job explaining this new system.
I highly recommend watching it to know what is changing on 5/2 when 10.1 goes live.
Hope this helps,