When all the step-by-step upgrades of M2 to M3 has been achieved, free 'M3 grade' status should have been given irrespective of the player's ranking, otherwise it is really unfair for a player to continually upgrade his M2 to the status of M3 and later finds out that he cannot upgrade anymore from M3 onwards, thus wasting all his time & crystals in upgrading his M2 to M3, instead he should have just buy the M3 from the start!