Also, you mention that the "grey-beards" are affiliated with the Companions. The Greybeards are the followers of the Way of the Voice at High Hrothgar. It is the Stormcloak-supporting Grey-Manes who are affiliated with the Companions;
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Grey-Manes, thank you. My mistake
I want to point out that they aren't Daedra Worshipers.
http://t0.gstatic.com/images?q=tbn:ANd9GcQsLKX0DcGvvBTHMFPsZ9pcrUPBNN5W7a-_g2O4H1nJFk2H5a9v5A
Aela is confirmed, a worshipper of Hircine.
2) The beast blood for Raido is also a figurative representation of the raw emotions he struggles to master after the loss of his family. If a person is strong enough to control them, emotion can be an excellent positive motivational force, but if someone isn't strong enough to master control over them, they will become destructive. The werewolf powers have a similar nature..
In the end, turning into a werewolf, sharing blood, etc... It kind of is valid, but so is vampirism then. It still inserts a bit of Hircine's soul in your body and might take over when your guard is down, you'll also not end up in Sovngarde with your family, friends, shield-brothers and sisters and other ancestors. You'll end up being the Daedric Prince's hound.
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Little interesting bit of lore, for all the lore nuts.
Several hundred years after the death of Ysgramor, the Companions as we now know them were soldiers for hire, little better than mercenaries. Our services could be purchased for the fighting of wars, but the commitment to individual honor meant that often Shield-Brothers would be forced to face each other on the field of battle. The bonds of honor which bind the Companions threaten to break, until Mryfwiil, in his wisdom, decreed that we would no longer be party to any war or political conflict of any kind. Because of his steady hand, the Companions today are known as impartial arbiters of honor, in addition to their glories on the field of battle.
Ok ok, I can accept they are a band of mercenaries that now avoid wars and accept other races. Its logical when there are more than 1 opinion about the sides of it and they are few, though being a private group they should stick to the one that pays.
And my point is still valid :< who says me, the dragonborn, cannot join The Companions with the intention of return them to what they were? Maybe still group of mercenaries, but at least not half beast. Kodlak is out there fighting his own war with the past Harbringers to free the other Companions that died and are trapped by Hircine's inner beasts, why not help cleanse them?
*NOTE* I say a lot about cleansing the curse of lycantropy and may look like i dont like it. I DO like it, i even tried a 24/7 werewolf with its own pack, and i must say that being followed by otehr weres and some wolves is tremendously awesome. But here i'm taking it from the point of view of a pure human (note, not nord, if it was pure nord then i'd not be accepting a dunmer in the companions), where accepting Daedra influence isn't good. Warriors don't need Daedric power to fight and win.
And no, I dont consider joining the Silver-Hand, I'm not Van Helsing (though he would be more a Vigilant of Stendarr...).