Should I prioritize getting him? or I can skip him for a while?
How important is Gromash for Warrior control?
But, out of the cards you're missing, I'm assuming you already have the other Legendary finishers (Ragnaros, Ysera, Alexstraza etc) in which case something like Gorehowl and Shield Slam would likely be better priorities due to them helping you get Board Control to be able to last until those finishers (Also, to clear the board so that a finisher actually works)
I really can't decide which I think is most important of those 3. My heart goes with shield slam, but you would really have to get some lucky business with Alex/Rag to close out games without Grommash. Maybe if you go Shield Slam first try and save at least one Inner Rage and add a Rampage in the deck for Alex (assuming you can bait out enough removal to make it work out for you). Unsure, good luck!
If you want to meddle around in casual or just play at a weaker rank then something like leeroy jenkins or even a rare charger like argent commander COULD work. Entire idea behind from is to combo it with a weapon charge (gore howl) once you opponent is at lower hp.
Grom is an important piece the Alexstrasza Grom combo is usually the game. He's also less random than Ragnaros which means you can win it without a clear board. He's a class legendary worth the dust. Your deck will suffer a little but it's not broken without him.
anything earlier than a finisher usually results is removal or mind control unless both sides are top-decking and playing the odds.
So in answer to you question, he's not a "control" card.. He's a finisher
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