Great old tree! The old bark is really nice.
But it has been neglected. And there are issues that need to be addressed.
It's important that you get in touch with Don and find out as much as you can about how it has been treated while in his care, and about how it was treated before Don. When was it repotted, and how. What fertilizers have been used, etc.
I think you can just cut those top two "antennae" off the top. The tree will never miss them!
It looks like Don decandled about 3 weeks ago. And new summer candles are sprouting. That's good. In about two weeks,begin giving it organic fertilizer cakes. Put on two or three the first week, add two or three more the next week, then add two or three more the week after. Leave on until frost, then remove them.
Hopefully, over the winter, you'll get some new buds on old wood to pop. However, on the main branches where there is heavy bark, you probably won't. The lower branches are bare. The interior sub-branches have died. Looks like some have been recently pruned off. That happened because the upper branches were not pruned or thinned, and the interior lower branches got shaded out and died.
You're going to want to fix this.
I'm going to tell you that it's not easy. At this point, the only way is to graft on new sub branches. Now, before you get upset, I'm also going to tell you that this "happens", and grafting to fix branches is a common practice in Japan. It does take some expertise, and practice. And good scions. You want to be able to take scions from the same tree, and graft them back on to the tree at different places. Right now, however, none of your existing branches look like good scions. You'll have to grow some.
So, I'm thinking you're going to have to wait at least a year before you can graft. I would get someone who is really good at grafting to do it. You'll probably need to have about a dozen set. Not all will take.
To repeat, it's a great old tree. It will be really nice in about 5 years when the grafts have taken, and you have interior branches again.