Whether sentence length is the exclusive means to determine if a subsequent sentence is more severe for vindictive sentencing analysis?

Whether sentence length is the exclusive means to determine if a subsequent sentence is more severe for vindictive sentencing analy sis? ii PARTIES Jarred Adams is the Petitioner; he was the defendant -appellant below. The United States of America is the respondent; it was the plaintiff -appellee below. Pursuant to Rule 12(6) Petitioner provides notice that Charles Cox was a party to the proceedings below, but Petitioner believes he has no interest in the outcome of this petition.