I do not know much about bloodlines in TBs but I will give you what I do know. Your horse is related to Native Dancer on both sides. He is known as a horse who passed on genes for weak leg bones. So don't take offense by me telling you this, I'm just giving you info. Barbaro, Eight Belles, Ruffian, Pine Island and Shenanigans were all related to him and all suffered fatal leg injures. Note Shenanigans was a broodmare at the time. I've met a handful of horses over the years that were related to this stallion and they did not have bone issues, I believe two were eventers (both since passed.)
Still Secretariat is a horse that was known to have strong legs, they often said he had legs like iron, so that may help to counter the Native Dancer blood. Bold Ruler was a mighty horse in his own right. He was related to the mighty Fair Play, sire of Man O' War, and that horse also proved to be very sound.
So your horse has notables in his pedigree and with the amount of Bold Ruler and Secretariat blood in him I'm sure that his genes will stay balanced and give you a good mount. Though it is to soon to tell what he will become, he's a shadow of his former self, you'll probably have lots of luck with him.
I'm sorry if I'm sounding like a know it all and or trying to scare you with worry about your new horse. I'm just giving random facts, some I did look up, on his blood lines. As I said before not all Native Dancer horse have that leg issue. I've looked up all the horses I've mentioned and out of them and noticed something. Pine Island, Barbaro and Eight Belles are all built very fine. Where's Ruffian and Shenanigans were built like tanks. What truly made Ruffian's break down fatal is that she refused to stop.
Pictures are in this order (left to right):
1. Bold Ruler
2. Native Dancer
4. Mr. Prospector (related to Native Dancer)
5. Northern Dancer
6. Fair Play
7. Hastings (sire of Fair Play)
8. Man O' War (not related to your guy but a prime example of what kind of horse Fair Play produced) Fair Play Hastings
Sorry for such a lengthy replay but you wanted answer about his bloodlines.
Also I like his blood lines (lots of well known racers in there.) I wish you guys both good luck in your adventures together :).