I think many of us not notice, but the Tamer [BT4-095] Yoshino Fujieda is very useful for any colors that using the digimon with "DigiBurst" effect, she can be the game changer at the right time. For the GranKuwagumon, when digivolve from LV5 to this digimon, we can rest Yoshino to minus 1 memory when digivolving, then use Hidden Potential to move up to LV7 Chaosmon: Valdur Arm with only 1 cost (so totally cost 3 memory to move from LV5 to LV7). I prefer to use Chaosmon Valdur Arm instead of Chaosmon for GranKuwagamon. After digivolve to GranKuwagamon, we can do "digiBurst 2" twice to make this Grankuwagamon gain SecurityAttack+2, but since it only has 11000DP, it is not safe enough to attack security, so we can digivolve to LV7 Chaosmon Valdurarm to perform SecurityAttack instead. The SecurityAttack+2 effect still remains with this digimon, so it's fine. 

If we use LV7 Chaosmon, the LV6 digimon need to be suspended, meant it has to do attack in current turn to able to trigger "When digivolving" effect of Chaosmon. What if GranKuwagamon died after first check? It is wasting right…