1st Scenario- Danzo mid difficulty
Sorry about underrating your favourite character Bogard but I feel that even with knowledge, Kakashi will run out of stamina. Also keep in mind that Kakashi's main affinity is lightning which is trumped by Danzo's main affinity which is wind. Danzo has mokuton which is a mixture of water and earth which will counter Kakashi's water and earth style attacks. Baki will be the end of Kakashi as it will swallow Kakashi and Kakashi can't do much except for waste a massive kamui which may not even work or just waste a huge amount of chakra. Without a defence such as susanoo, Kakashi is screwed.
True that Danzos main affinity is stronger than Kakashis main affinity but here it depends on the power now and Danzo has shown no wind jutsus powerful enough to be able to match a raikiri for example in close combat. And in long range, i've already shown you the power of his suiton jutsus, he also has doton jutsu to protect himself, like he could hide underground and put a clone above in order to observ the ennemy. And his clone is really strong. Just look that his clone almost manage to kill Asura path with a Raikiri if he didn't had Rinnengan Share vision(Deva looking at him) and in the contrary, i've also notice that Danzo is not that fast and really careless when he uses Izanagi.
So basically the use of clone in this fight cancells Izanagi from Danzo and he could even try to take advantage of this if his clone manage to hurt Danzo sometimes. Just remember that he could not even dodge a shuriken:sy: That's why i see him trowing some of his Izanagis stupidely during this fight.
If he has full knowledge about Izanagi like i've said, he will know that to use Izanagi, you must make some handseals and could prepare his strategy to strike the moment one Izanagi is finished. Basically it would be like his fight against Pain where he wanted to pass through the 5seconds. So puting a Kage bunshin as a feint when Danzo in Izanagi state fights him, when Izanagi disappears, he could come up from underground and strike directly. He has shown to be able to feint even a good and intelligent sharingan user like Itachi with this strategy, he even feint a Rinnengan user, so it's something he could perfectly do here. This is where full knowledge could help
Now without knowledge sure it would be more difficult, but i don't agree with you saying it would be that easy for Danzo. Like i've said earlier, he always uses Kage bunshin when he has no knowledge about the ennemy. So even if Danzo uses Izanagi, he will be fighting a clone at that time. Meanwhile, Kakashi would be there to observ his movements and possibly find his weaknesses. At that time also, Danzo in Izanagi state could disappear either because Kakashis clone hurt him or the time limit of Izanagi reached.
I'm sure Kakashi could know how Izanagi works since Sasuke knew it after a period of time, but even if he doesn't know, he will still be worrying about how Danzo is regenerating that way even if he sees it one time.
Knowing how carefull Kakashi is, and seeing that he doesn't fears anymore to use Kamui, i see him trying to make distance with him and find his way or understand more about this jutsu. We've seen that he is the one who could control the amount of chakra he can use in his Kamui. He used a huge amount to try to warp Gedo Mazo cuz it's big, but Danzo is much more smaller, so it won't be that necessary. If he tries to kill Danzo with Kamui, Izanagi could probably save Danzo, but with time, he could notice things that could help him at the end to finish this fight