What if when the Animorphs and their families were in the hork-bajir valley, they gave everyone the morphing power? Maybe not Sara or anyone else too young to understand, but all the adults, Toby, and any responsible hork-bajir. At minimum it would give everyone the ability to survive horrific injuries, and they might get more branches of Auxiliary Animorphs on top of it.
(partly inspired by the line in your fic where Jordan mentions she was older than when Rachel was when she started)
Peter: The best morpher. He understands how the technology works, better even than Ax does, and he can follow orders like a champ. Though he's no andalite when it comes to tracking time, he seems to have better numerical estimation abilities than the others and that'd serve him well. On the parents' auxiliary team, I could see him in a role similar to Cassie's (being able to do partial morphs) or Tobias's (the first one to try the weird alien morphs).
Naomi: The diversion expert. She's good at getting and keeping attention, and pretty dang fearless. So she'd take on a role like Tobias does sometimes where he flies around drawing fire from the others by keeping just out of range. If she could find a bird of paradise morph that might suit her, but I could also see frilled lizard or blue-spotted monitor working well in that role since reptiles can be a little hardier than birds and survive a hit or two.
Michelle: The one evacuating civilians. She abhors violence, but she's also hard to scare. So I could see her morphing elephant, or another people-mover giant herbivore, and rushing in to grab bystanders out of the line of fire and carry them away. If she grabs a few human-controllers in the process, that's fine; once word gets around that she is actually willing to return any surrendered yeerk to the pool in exchange for keeping the host, lots of yeerks would be willing to work with her after being accidentally captured.
Eva: The leader. She'd acquire the biggest baddest hork-bajir whose permission she could get, and she'd put herself at the vanguard of the team. She'd also default to leading the auxiliary family team due to wealth of relevant knowledge and tactical experience. This would naturally lead to a lot of clashes with Michelle, but I think they'd be able to find common ground on wanting to save humanity more than any other priority. Plus...
Walter: The peacekeeper. His role would be sort of like Jake takes on during the downtime, working to smooth over conflicts between teammates and make sure they all keep their eyes on the ball. If Eva's the tactician then he's the strategist, thinking long-term about what kind of Earth they want to have left when all the dust clears. In terms of fighting style he'd be the versatile support person, maybe elephant morph as well since it can serve as a diversion or a people-mover or a tank depending on who must needs backup at any moment.
Loren: The tank. She's got that "throw rocks first, ask questions later" attitude that helps her charge into battle against pants-wetting odds, and she's proven to be suicidally brave (or just suicidal) under fire. Depending on what the Gardens has, I could see her getting cassowary, gharial, orangutan, something else that gets a what the fuck reaction from Californians in the second between seeing it and it fucking you up. She's also known to have really good aim, so post-re-ensightening I could see her literally just picking up a dracon beam and blasting away at her enemies.
