It sounds like the talon is only meant to be used with a string loop, whether it's fixed to the release or the bowstring.
Yes, that is correct. And remember that the heads are interchangable. You don't have to buy a whole new release if you decide you'd rather have the other.
Don't get me wrong though on the double ball. It isn't bad at all, if you use a peep, it has an advantage of lining it up for you. Also, you still hunt, you can attach your release to the string, and leave it on (you can do that with a talon and string loop also).
I'm simply saying that there are times in the field when it is necessary to expedite the releasing process. This may be at the expense of a bit of accuracy but if the group grows from 2" to 3" at 20 yards
I agree about expediting a shoot. If you practice smooth releases however, the accuracy issue should be minimal. It still has to be smooth however.
The 'expert' was saying that the drop in accuracy is more drastic with the t-grip.
I don't know about that, it sounds like his opinion, I guess.