Yes the anemone is bleached, Heteractis crispa are often bleached when they are imported. For whatever reason, that species seems more eager to expell the zooxanthellae. Also, unfortunately that species is most likely to be dyed. In any event, the anemone looks to be healthy otherwise. Often times, H. crispa will recover their zooxanthellae and do fine as long as the anemone is in otherwise good condition (e.g., no tears, no bacterial infections), and you can provide it with excellent water conditions and appropriate light.
As far as your ocellaris being hosted by H. crispa, it's a crap shoot. H. crispa is not a natural host for ocellaris, but in captivity it happens.
And yes, mags are a sure shot with ocellaris, as they are a favored natural host in the wild. BTAs are not a natural host and are definitely not a sure thing as far as hosting ocellaris, although ocellaris often will take to BTAs in time in aquariums. Unfortunately, mags have a more dismal survival rate than H. crispa. They are notoriously poor shippers. They aren't so inclined to lose their zooxanthellae (bleach) as H. crispa, but the shipping process indeed takes a toll on them.