Well as Psuedos go, I always figured that Ginkaku and Kinkaku were special cases because they ate part of Kyuubi. Of course they were distantly related to the sage of the six paths, so it was rather hard to discern how much of their uniqueness is due to what.
The main things I can see from the manga, after 2 weeks of their feasting before being vomited up, are unusually large chakra pools and powers similar to the jinchuuriki. Kinkaku is said to be able to go V2 with 6 tails. His power is said to have been enough to nearly totally demolish the entire 4th division of the allied shinobi forces. And both brothers together nearly kill Tobirama Senju, who was no slacker. The second Raikage was there with Tobirama at the time but his fate is unknown. Since they were only declared disgraces for their deeds I can't imagine that A was killed in the event and probably escaped too.
I have never had them go all out on anyone, but that potential is there.
Hesitant to be OP, I have never had Yugito do things like bijuu bombs. She can use the blue flame, create a fire ball big enough to one shot large buildings, the nail growth ability seemed to be unrelated to being a host. I have had her have enhanced strength and endurance, but was hesitant to actually assume any cloak. Keeping a passive power with her already having a katon affinity, just to turn her flame blue...well, so what?
Basically I think the two cases here are significantly different. I don't think ex-hosts would be as powerful as the brother have been shown to be in the manga. I am not comfortable with ex-hosts manifesting cloaks...Gaara never did.