If a company employee admitted to a fact that was damaging to the company's case, then that could be a real problem. The spokesperson's judgment of the "obvious[ness]" is just an opinion, though, rather than a factual admission. The courts aren't likely to take that opinion as gospel. In other words, that statement won't short-circuit the court's normal process of evaluating the evidence and determining whether infringement has occurred.
Given that, who would win? I don't know. I'm just saying that the spokesperson's statement doesn't automatically scuttle whatever case Starbucks might have.
Also worth nothing: Another possible claim would be trademark dilution, which, unlike infringement, doesn't require likely consumer confusion.