You're not absolutely certain, but you don't think Sayaka's Soul Gem is filling any faster than it had when she'd had only Mami's ribbon powers. Perhaps the difference is so small you don't notice it, or perhaps you're remembering wrong, but you don't think so.
That's interesting and very, very usefu-
...
"Oh, and before I forget - Sayaka, you're still holding onto Nadia's and Mami's powers, right?" you ask, glancing up from the marble.
"Um? Yeah, I got 'em," Sayaka confirms.
"Right, hang on to them," you say.
Sayaka nods, looking thoughtful as she bends forward to inspect her own Soul Gem.
You return your attention to the Grief. Compressed, it's just a dull, dark purple that's nearly black, and mottled with different colours. And you... want to get rid of it. You're not unaware of the possible consequences, especially with regards to Kyuubey. But this is a small scale experiment, and to be frank, a magical girl dying is also lost energy to Kyuubey, as little as you like thinking about that prospect.
A slow breath out. You'll try simply willing it gone, first.
And so you try. You try vanishing the Grief with your will, but all that gets you is a blinding migraine that has Mami looking at you in concern. You try creating a device that can delete Grief, but that accomplishes nothing at all. In a fit of pique, you recreate your Infinity Gauntlet of Enchanting and try to enchant something, to no real success.
You do earn a look of fond exasperation from Mami, though, who's wrapped her arms firmly around your waist so that she can tuck her chin on your shoulder.
"Aha!" Sayaka says as you reach the outskirts of Ishinomaki, interrupting your enchanting.
Which is fine. Just fine. It wasn't working anyway.
You dissolve the gauntlet with a sigh, flicking the wisps of Grief off your hand. "What've you got, Sayaka?" you ask, dropping the speed a little on your platform as you coast in amongst the skyscrapers of Ishinomaki.
She holds up a little five-lobed charm made of blue crystal and trimmed with white. "Mami's ribbons," she says proudly.
"... eh?" you say. "... wait. Did you do what I think you just did?"
Mami holds her hand out for the charm, turning it over in her hands. "You managed to store your copy of my magic?"
"Yup and yup!" Sayaka says proudly. "Cool, eh?"
You're about to answer when a telepathic message intrudes. "Hello, Miss Sabrina!"