You ever oversell your players from their overseas days.
Matsui was a great player in Japan, but he benefited from playing for the most popular team in the country, the Yomiuri Giants. Ichiro played for a far lesser team, the Orix Blue Wave, but when he left for Seattle, attendace plummeted for the team. Heavily. Conversely, post-Matsui Giants continued a half-century long string of sold out games.
Really, while the Yankees are certainly putting together a good team, so is Texas, and so is Minnesota (surprisingly). If Otani wants to be the proverbial Big Fish, he stands a better chance there.
Seattle has the obvious proximity advantage, and the Angels do as well. The Mariners in particular have a long history with Japanese players tha extends beyond Ichiro (who I would bet is not remembered as a Yankee in Japan).
But really, the most popular player over there in the past few decades was Daisuke, a player Otani possibly idolized at one point. But the Sox are going to be on the outside looking in on this one, unless the situation is unresolved this year..