I've gotten confirmation that u/KaaraRaven is not actually Sam, and is somebody else living in the UK.
It appears there's been some convergent thinking here, both having raven fursonas named after the Japanese karasu tengu, which can also be spelled as kaarasutengu or kārasutengu. So this isn't much different from two different dudes naming their fox fursonas kitsunefox or kitsufox or something along those lines. It's just a lot more rare being that birds aren't as common for fursona types as foxes are, so it's a weird coincidence.
I can confirm this as I have been contacted by u/KaaraRaven and have been shown proof he's not the same dude, and he's certainly not living in San Francisco.
I would but this guy is extremely paranoid and in order to get this confirmation, I had to assure him that I would not post it.
Part of my job as a moderator involves keeping things in confidence if a source needs to be verified but only wants to do so privately. I have absolutely no vested interest in this dude, I have no idea who he is, I don't know him from Adam, but he was very much freaked out that he was accused of being Sam.
I can give you my word that this is a different dude, he provided evidence of a UK driver's license that was timestamped, and since he is a different dude, he's no longer relevant to this thread.