Former Sabah chief minister Tan Sri Musa Aman arrives at the Palace of Justice in Putrajaya September 7, 2020. — Picture by Yusof Mat Isa

KOTA KINABALU, Sept 8 — As newcomer Parti Pribumi Bersatu Malaysia (PPBM) wrestles Umno to take on Warisan president Datuk Seri Shafie Apdal in the upcoming Sabah election, political analysts say there is only one real challenger who poses a major threat for the chief minister post — Tan Sri Musa Aman.