The prophets’ lives, ordeals and audiences differ. These variations do not imply that prophetic office must always appear in one fixed historical pattern. Different responsibilities and circumstances can coexist with continuity in fundamental divine guidance.
Likewise, the historical presence of many Israelite prophets does not by itself prove that no future true prophet could arise from another lineage. That argument turns a past pattern into an absolute future prohibition without establishing the necessary premise.
Evidence for a claimed prophet must be evaluated in its own right. Ancestry or difference from inherited custom is not a conclusive refutation by itself.