I agree with that. Not sure if Nishikori is playing as well now as last year. He started 2015 looking average. I do not think of Stan as a force anywhere. His mind just is not there. Rafa is similar. How he lost to Verdasco when his opponent fell apart in the second set i have yet to find out. I went to bed at that point because I thought it all over! My worry is Berdych who until last time out seemed to induce poor play from Andy. He might stumble and not recover before then? He has looked shaky in his matches.
Nishikori had a good round 2 win but his opponent is a shadow of his former self. He plays Troicki next, while Raonic plays Chardy. I expect Raonic to be untroubled, but like you I'm not so sure about Nishikori - I think he is having a slight struggle to become accustomed to being in the top 5 rankings and to face the greater expectations that come with that ranking. But the courts here suit him better than those at IW, and I expect him to deal with Troicki fairly straightforwardly. Neither Raonic or Nishikori faced break points in their first matches.
The Nadal match last night was an odd one. I watched it all, and Verdasco came out a little flustered at the beginning of the second set. He'd had some problems re-wrapping his grip and then taping the wrap down, and ended up having to grab another racquet from his bag when the umpire indicated he was out of time. Then his shoes broke - one of the eyelets (if you can call them that when they are essentially just a small strip of folded fabric) on one of his shoes broke, and with it the laces on that shoe.
Verdasco got distracted by all this and his level dropped. Nadal began playing a bit better, but he couldn't consistently hit anything with any depth. Verdasco would normally fade away after a set like the second but he showed great tenacity early in the third and his level rose again. Nadal is lacking in confidence at the moment. His second serve is shaky, his ground strokes are coming up very short indeed. He's playing safe, and then when he goes to attack he is making errors a lot of the time.