Hero's Blood: A White Cloak for Ser Glendon Ball (Spoilers Extended)

Ser Glendon Ball/Flowers is the apparent son of Fireball who we meet during The Mystery Knight, where is is accused of stealing the dragon egg.

The goal of this post is to gather any evidence, foreshadowing, or anything that disqualifies, etc. him from ending up on the Kingsguard

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My original thought about this theory came from this quote:

"That's true enough," the boy said grudgingly, "but my father was once promised a place amongst the Kingsguard. I mean to claim the white cloak that he never got to wear." You have as much chance of wearing a white cloak as I do, Dunk almost said. You were born of a camp follower, and I crawled out of the gutters of Flea Bottom. Kings do not heap honor on the likes of you and me. The lad would not have taken kindly to that truth, however. Instead he said, "Strength to your arm, then." - The Mystery Knight

As of now the only confirmed member of Egg's kingsguard is Dunk with Ser Gerold Hightower a very likely member as well. At a minimum 5 unknown members of Egg's kingsguard.

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Egg did things that angered certain lords, while there is no evidence this is one of them, this is the type of action (naming hedge knights to his kingsguard) that would anger prickly lords.

Prince Aegon was the obvious choice, but some lords distrusted him as well, for his wanderings with his hedge knight had left him "half a peasant," according to many. Enough hated him, in fact, that an effort was made to determine whether his elder brother Maester Aemon might be released from his vows, but Aemon refused, and nothing came of it. -TWOIAF, The Targaryen Kings: Maekar I

They form at least some type of kinship:

"His Lordship said that I had no right to put a fireball upon my shield. He told me my device should be a clump of pussywillows. His Lordship can go bugger himself." Dunk could not help but smile. He had supped at that same table himself, choking down the same bitter dishes as served up by the likes of the Bright Prince and Ser Steffon Fossoway. He felt a certain kinship with the prickly young knight. For all I know, my mother was a whore as well. "How many horses have you won?" -The Mystery Knight

Glendon was the type of person you would want on your kingsguard:

"—is Daemon, aye. They told me. The Black Dragon." Ser Glendon laughed. "My father died for him. I would have been his man, and gladly. I would have fought for him, killed for him, died for him, but I could not lose for him." He turned his head and spat out a broken tooth. "Could I have a cup of wine?" -The Mystery Knight

He could have gone North with them and I'd consider Egg "one of the good ones":

Ser Glendon shrugged. "I lost count. Mortimer Boggs still owes me one. He said he'd rather eat his horse than have some whore's bastard riding her. And he took a hammer to his armor before sending it to me. It's full of holes. I suppose I can still get something for the metal." He sounded more sad than angry. "There was a stable by the… the inn where I was raised. I worked there when I was a boy, and when I could I'd sneak the horses off while their owners were busy. I was always good with horses. Stots, rounseys, palfreys, drays, plow horses, warhorses—I rode them all. Even a Dornish sand steed. This old man I knew taught me how to make my own lances. I thought if I showed them all how good I was, they'd have no choice but to admit I was my father's son. But they won't. Even now. They just won't."

"Some never will," Dunk told him. "It doesn't matter what you do. Others, though… they're not all the same. I've met some good ones." He thought a moment. "When the tourney's done, Egg and I mean to go north. Take service at Winterfell, and fight for the Starks against the ironmen. You could come with us." The north was a world all its own, Ser Arlan always said. No one up there was like to know the tale of Penny Jenny and the Knight of the Pussywillows. No one will laugh at you up there. They will know you only by your blade, and judge you by your worth. -The Mystery Knight

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Glendon Ball was Pretty Damn Talented.

• He unhorsed Ser Argrave the Defiant, Lord Alyn Cockshaw, Lord Costayne, and Ser Mortimer Boggs

• Had the Blackfyre conspirators so worried about his talent that they framed him for stealing the dragon egg

• After being tortured and losing a ton of blood, he was still good enough to defeat Daemon Blackfyre

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The biggest downside to this theory is that there is literally no other mention of him outside of The Mystery Knight. Which while somewhat of a problem, the fact that we know so little about Egg's kingsguard in general doesn't make this too big of an issue for me.

Maybe he even died at Summerhall as well. Since he does happen to have Hero's blood after all. Or maybe he ends up fighting against them in the Third or Fourth Blackfyre Rebellions.

"Ser Glendon has hero's blood," Dunk blurted out. -The Mystery Knight

TLDR: Attempted to come up with as much evidence as possible to see if Glendon Ball could have ended up on Egg's Kingsguard. Some decent possible evidence exists but not even close to enough to confirm anything.