Eggbar shoes for Chubacca

I knew I was asking about feet for a reason a while back. I suppose there should be some background before I ask the question, so nobody thinks I've made the shoe decision without consultation ...

Went to visit Chewie's last owner two weeks ago. She climbed on & rode him a bunch. Made a bunch of observations, the primary of them being that he's not soft, not flexing, and needs too much contact to behave. Halfway through the weekend, she said "Leave him here. Pay me $XX to cover groceries and a portion of my normal training fees, and I'll get him softer and better at the canter so both of you aren't learning together." I thought about it pretty hard, and decided it was best. Besides that, her husband's one incredible farrier, and I knew Chewie's feet needed work. Front right is so contracted I wasn't sure what else to tell the local farrier to get him to leave some heels & trim more toes.

Farrier husband Jimmy called me last night, said "We need to talk about some important decisions before I finish your horse. He needs eggbar shoes, and somehow we need to train your local guy to do it right, or your horse is gonna end up lame all the time." I agreed to the shoes, because, if I understand correctly, they support the heels, which should allow them to spread out, and eventually he won't need them.

Am I right? I don't have good photos, but I did see with my friend & her hubby's description that his outside front right heel was bent in, and not spread out at the bottom. What makes eggbar shoes helpful for a horse that doesn't have navicular (which is the only thing I've ever read they were used for)?