Don't think of corr for Rose as a support character sphere. Corr 2 would mainly see use as a conjunctional effect. I mean at corr 1 she'd have perfect 360 degree blindsense, which is very solid, but at 2 she'd be able to use life or matter to pull things out of her pocket on demand, not to mention using corr to countermagick or other neat things.
Hm. Point taken. I can see it in that case, though not above Time 3 and certainly not above Matter. I suspect the apporting limitations mean Rose would be better off in most cases just spawning whatever Basic Life from her flesh.
For Donald, I want Spirit. It's a remnant of his CoX days, and stands a good chance of letting him synthesize those with his current paradigm. I think it's the most effective way to break the Enlightenment 6 ceiling. Spirit 5 lets you forge spirits outright, with whatever qualities you like. It also lets you perceive Avatars, which may aid that whole E6 thing, and is probably here because of the "perceiving Janice as Amy" thing. It lets you go to and survive in the Deep Universe, which we may need to do again at some point for reasons, or use it to get favors from the Void Engineers by retrofitting things with Deep Universe capability.
Primal Utility 5 is a close second, because it lets him create permanent 'blessings' on living things, like cyberware or other persistent things. It also allows counteracting Paradox, which would give him a definite niche as a support dude since he can just go 'pour all the Primal Energy to make Paradox ignore us' while giggling.
I can see how Time 5 would be useful sometimes, but it just... isn't really that much. He can time travel, or ZA WARUDO, or possibly scry all of time forward and backward in a moment of perfect comprehension. Which is rad to experience but not really... useful. He can already freeze people and go into superslowtime, that's not new, and time travel is almost always a terrible idea.
Mind 1 is a must in my opinion, especially given all the mind-control that's been thrown around. Donald can already laserblast Matter patterns, Forces is kinda meh for me, so I'm gonna go with Corr 4 and Life 2 here (for commisioning mat-trans and Voidcasts, effectively being in multiple places at once especially in the Web, self-healing, and being super fit).
Entropy... loses to the combination of "Mastery in a Sphere" and "Jamelia already Entropies everywhere", in my mind. It would be a solid third choice, we just don't have three choices here.
[X] Correspondence 3->4 (Multitasking), Mind 0->1, Life 0->2
[X] Spirit 4->5