Hi & welcome.
Yes, some different angles would be helpful if you want a proper critique - see link below. That 'notch' looks to me like it could have been due to a bump/small abscess on the coronary that's grown down? Wouldn't be worried about it, though now it's near the bottom, if feet aren't kept well trimmed/balanced, it could lead to a crack.
Yes, it appears that if there's 'WLD/seedy' it's probably only quite superficial as yet, tho again pics aren't clear enough & fresh after a trim would show this best. The wet environment would be playing a part and keeping him on dry as much as possible combined with topical treatment should get rid of it or at least keep it superficial. I wouldn't imagine it's wall infection that's making him sensitive.
Like I said, better pix needed, but it does appear his walls are long & flared. Stretched a bit right the way round, esp on the outside. Check out the ELPO website for good info on assessing balance. Depending on what he works on, perhaps a bit long walled from the ground surface too - eg if on hard ground long walls cause too much peripheral loading. May be that hes not trimmed frequently enough. While 4-6 weeks is the norm, many horses need more frequent trims. Frogs & heels don't look bad but not the most robust either.
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