To be honest, out of these 6 legendaries only 2 are crucial: Alexstrasza and Grommash, the rest aren't really needed at all, and I'd argue that other than Baron Geddon who is a very powerful staller, the rest shouldn't even appear in Warrior control decks but people play them because they already have them. As long as you have Alexstrasza and Grommash you can pull off your combo, Alexstrasza to put your opponent on 15 life than Grommash+Inner Rage/Cruel Taskmaster for 12 damage, last 3 comes either from a minion you already had on board or a Fiery War Axe/Gorehowl you already had in play.
This is the gist of it, the rest of the deck is all about controlling the board and stalling, something that Baron Geddon helps tremendously with, Cairne is questionable as if he doesn't get instantly removed/silenced he is a decent road block but he's most likely gonna eat removal. Which is something you really don't need removal magnets as even if Alexstrasza dies instantly he still did his thing, leaving Grommash to clean house with his charge, so again no possibility of removal before death. Ragnaros and Ysera are alternate win conditions, weak ones at that, and I find completely unnecessary for the above reason. Control Warrior, unlike other control decks, doesn't run a lot of fatties like Giants based decks, in fact it doesn't run a lot of minions at all, unlike non Giants based control decks like Druid, Shaman, etc, so Ragnaros' 8 damage to the face is highly unlikely to be anywhere near finisher material and it's not like you have a good way to follow up after he gets dealt with the following turn. Ysera is simply slow and unless you draw Ysera Awakens is also a low impact minion unless she somehow sticks around for a long time, which again is a very unlikely scenario.
So instead of Ragnaros, Ysera and even Cairne I prefer cheaper minions/spells that actually help you to control the board and stall the game. If you ask me, 2 legendaries is not excessive at all, and even if you go 3-5(Baron Geddon being the 3rd, than Black Knight and/or Nat Pagle) you're starting to go overboard but as I said, those aren't really needed, just solid to bring if you already have them. Don't bother with the rest, even if they're great in other control decks as Warrior control is unique and works very differently from other control decks.