I agree. I'll boldly go one further: I think they do their best when Danny's skating and his smile are highlighted, while Tarah holds up the quality of the pair. Kind of the opposite of the "Man=Stem, Woman=Flower" classic pairs formula. I'll boldly go another: I think Jim Peterson is the one who understands this about this team, i.e. he really looked at them before choreographing. In the last two seasons, it seems Tarah is meant to be the focus of the audience's view, and it doesn't work (for me). Their 2015-16 season exemplifies, for me, everything that's wonderful about this pair.
I'll add that I don't see Danny switching partners. He's said more than once that's not in his sights.
Yes. The most sorrowful thing after their nats FS was Tarah's seeming inability to realize that Danny, being the one who felt most responsible, needed support in those moments. If you look back at pairs and dance teams' bigger errors, it's more usual to see the partner who held up their end reassuring the other person. It's called empathy. In fact, Meryl Davis has talked about a time when Charlie made about 3 big errors in one dance; he kept falling, (when he almost never fell in performance). Meryl is seen doing the comforting and reassuring afterwards. In telling this story, she said that before that skate, she'd thought of Charlie as the leader in the partnership. This was when she stepped up to be the equal partner.
The situation with Meryl & Charlie really did make them a stronger team. All of a sudden Meryl found her power and they got stronger and more equal on the ice. It was at this time that they began to pick up ground on Tessa & Scott. I have been digitizing my videos from this period and found the development fascinating upon rewatch.