As far as I know WMKN's radar still isn't in service, so that might have been a factor in the crash. Why? The Batu Rakit/Merang/Kapas Training Area is like a playground with no monitors, unlike Langkawi where everything's positively controlled.
Apparently they lost control in a steep bank at low level. Maybe SyrianAviator can confirm this.
It's sad that something like this had to happen