The sentence that contains a nonrestrictive phrase is:
Our coach, wearing the whistle, is really great.
In this sentence, the phrase "wearing the whistle" is nonrestrictive because it adds extra information about the coach but is not essential to the meaning of the main clause. The sentence would still make sense without it: "Our coach is really great." The other sentences contain restrictive phrases that are necessary to identify which team or person is being referred to.