Is there any actual evidence suggesting MH370 went North, West, and then South to avoid flying over Indonesia or is it based solely on the Indonesians saying they never picked the plane up on radar so it couldn't have flown over their airspace?
Absence of evidence is not evidence of absence.
Near as I can tell, the only actual radar evidence comes from the Malaysian military tracking the flight and showing that it made a westward turn near IGARI, headed back across Malaysia and into the Malacca Straight before disappearing again near Pulau Perak. Everything the media is reporting about the path it took after that is just speculation based on what other countries say they did NOT see that night.