#{scarlet shadow}

Good question.

For Renly, there's a few things. For one, the Rainbow Guard doesn't have a tradition that it has to live up to, it's an entirely new organization, one that Renly hasn't even completed yet, with no traditions to transgress. For two, Brienne had won a melee, and won a right to ask a boon. To reject it is to say that the royal largesse that Renly offers is not worth anything.

For Sandor, the Kingsguard has actually seen a significant break in tradition already. Ser Barristan, Lord Commander and decorated hero, was dismissed unceremoniously from his position to make room for Jaime. Outside observers would see Sandor's non-knightly appointment that as yet further corruption of Joffrey's court.

Jaehaerys, keenly aware of the power of symbol politics, would be loathe to avoid that problem. He's also smart enough that if this was something he'd desire to do, he'd create a new institution entirely to avoid any potential transgression of religious matters or threats to the aristocracy. Hence why I suggested a third path for Jaehaerys if that's something he wanted to do.

Thanks for the question, Anon.

The ninja’s menacing tone only prompts mirth-filled laughter from the spellcaster, and she busies herself with pouring her tea with a little quip of,

“More for me then!” Despite the ominous figure Saizo cast, she didn’t seem really bothered by him watching her. For a long moment, going about her business, the small woman is silent, and doesn’t seem to even acknowledge that he has shown himself from the shadows, before she turns, smile lighting up her face as per usual in the presence of another person. 

“So, you’re determined to watch me, is that it? Well, I can assure you I will do no harm to your Lord, or anyone in this army. Not intentionally, at least. But, if you are so very determined to keep an eye on my actions, I do not object. You wouldn’t be the first person to deem me untrustworthy.” Something changes slightly in her expression at the mention of this, but it’s so subtle that it doesn’t really matter as she passes right through it with another smile. “Your name is Saizo, correct? As I’m sure you know, I am Inshel, but it is only proper of my to introduce myself. I do hope you come to find my being here something you can tolerate. After all, I wouldn’t want you to get bored watching me experiment and write notes all day.”