Well, I haven't exactly tried to trace Dr. Yang's lineage to see whether or not it goes back to one of the same teachers in our line as I know it. Considering the apparent similarities between what I've seen of his stuff and know of our stuff, it's possible that we do have a common teacher somewhere down the line. But I think he does 12 road tan tui:
http://store.yahoo.com/ymaa/shaollonfisk2.html
http://store.yahoo.com/ymaa/shaollonfisk7.html
IIRC, the first few routines are pretty similar in both the 10 and 12 road versions. It's later on in the sequence that the routines start to diverge. That video of Han performing tan tui is essentially what we learned, maybe with a few fairly minor differences. Since our line derives from Han according to the info on the web page linked above, I suppose that's to be expected.
As for the inclusion of non-Shaolin stuff, well, if you look at the link I gave above, you'll see that there are forms from other systems in there, too. For example, it lists Kao Chuan as Hong Jia in the "other" section of barehand forms; we were taught that one and told it wasn't exactly long fist, but was similar in style. I could be wrong, but this didn't seem all that unusual to me. And IIRC, in the Yang and Bolt book, when the forms aren't exactly Shaolin, he does say something to that effect. And it think it's only the last two of the five forms that aren't exactly Shaolin because we were taught the first three (Linking Step, Power First, First Ambush) and they're all listed as long fist forms on that other web page. So it's not more than half, but almost half.

Maybe Yang does call more things "Shaolin" than he should though. I don't really know enough about what exactly is or isn't real Shaolin style to say.
BTW, if this is drifting too far off the topic of listing northern styles, I suppose we can break it off into a new thread or continue it in one of the othre threads where we were talking about tan tui and such.