JB, if they look really healthy, they probably are, and I wouldn't worry further about them. There are some that rebloom in our zone, and that appears to be what you are getting. I bet they will bloom again in the spring.
Immortality, a white one is known for rebloom in Z6 (and elsewhere).
It's so hard to identify an iris from a picture, that we don't even try to do it. I have some un named ones too, and I love them just as much as the named ones.
That yellow is gorgeous! What a great surprise this time of year!
You can cut your siberians back now, even though they are still green. I cut mine back in the spring, but at this point it's more a matter of what is convenient for you.
If you have any questions, just ask away. Someone will help. But it looks to me like you're doing things right.
Please stay with us on this forum. I'd love to see more pics in the spring.