Well this is possible considering that in ending of the end in was revealed that Discord was disguised as Grogar.

oooooo so close

It might be an interesting concept to explore, but this theory got jossed pretty hard.
 

 
A theory like ‘Grogar is Discord in disguise’ might hold water, but not this one because they’re both in the same place at the same time. Unless you want to claim it’s some sort of ridiculously elaborate illusion where he’s going out of his way to argue with himself (with two different voices!) and pretending to betray himself behind his own back. And if he’s that good of an illusionist, then why would he include the selfish and vain Chrysalis in his plan if he can create believable impersonations of people all by himself?

Emmmmm, well………

’ illuminati theme plays ’

Too oddly specific to be true, but I do not consider it too far fetched for Grogar to secretly be Cozy Glow. The book Twilight was reading that mentioned Grogar did refer to him as the “Treacherous Grogar”, which might reference his ability to take other forms in some way to manipulate people.

look all of you have your own opinions but let’s just wait until season 9 comes and see who’s right and who’s wrong, okay

@Background Pony #82A7  
Obviously, Grogar is Cozy Glow and Tirek’s baby.

well the picture and those words are fake i highly doubt that cozy glow is grogar that’s just ridiculous i know there’s good in cozy glow just wish we could learn why she do this perhaps when she is done with her part he has no need for her anymore perhaps maybe tirek will ask for help from the mane 6 the young 6 starlight glimmer Spike and the Cutie Mark Crusadersand and the others they might seem cozy glow but not only her but equestria and everyone else from the demonic one Grogar then tirek and cozy glow will be reformed and see the true meaning of friendship.

Not buying it.|| Grogar is probably somewhere else in Tartarus so and forgot to escape.||

That’s kinda stupid but maybe slightly plausible

it would be a terrible way to ruin the character of Cozy, I still want to think Cozy is just Cozy.

I can dig it! I wish it could be true…

@JazzyWaffles  
If I remember correctly, he season 9 premiere mentioned that Grogar would be breaking out of Tartarus, the same place where Cozy Glow is. That doesn’t contradict my headcanon.

Sorry to break it to you, but (spoilers inbound, no really I’m being serious) this headcanon is getting shut down pretty much immediately. As in, Season 9 Premiere immediately.

Maybe, bot probably not.

Intresting, but i see her as Grogar aprentice or something

Is this what the “Cozy Glow is Chrysalis”-people are doing now?

Would be really great if that happen… a maquiavelic kid isn`t normal, must be that.

While quite the stretch, I can definitely see this happening…

@GUILLE832  
Good point.

@Astral Phoenix  
He forgot. It’s been over a thousand years.

But then why didn’t Discord recognize him/her while in the episode “A Matter of Principals”?