Bless you for taking this poor baby in.
Many times when a horse looks club footed it is due to heel pain caused by incapsulated thrush in the frog. When there is pain in the frog the horse grows heel to try to lift the foot off the painful frog. There are several remedies but I use ionic silver (kinda like colloidal silver but less expensive, look on line) to soak the feet in for a minimum of 5 hours in soaking boots. This gives you a three day window where the heel will start to exfoliate and allow your trimmer to start to drop the heels only to the level of the hard or live sole. Once you have good frog pressure it will continue to help the foot re-align by exfoliating the sole it doesn't need and continue allowing your trimmer to trim to the hard sole again.
The crack is most likely being caused by pressure from the top of the coffin bone pressing on the inside of the coronary band. By getting this horse's heels down, the coffin bone will start to re-align itself to a ground parallel position over time. Don't make drastic changes but with treating that frog pain the heels will come down. Like Zanytactic suggests, have your farrier/trimmer go to www.swedishhoofschool.com
for some good info on this. The horse should be trimmed at least every 2 weeks.
The horse's bars are also neglected that's why it has flares on both front feet. Give him some bute the first time and have your farrier work on the worst foot first to get rid of the most painful part. Which will most likely be to trim the bars and heel that are just collapsing out then give the foot back quickly. That will help the horse a lot and he may allow more work because some pain would be alleviated and he'll give your farrier/trimmer cudos for knowing how to make him feel better and not making him stand on it for a long time.