Unless there is a direct statement from the story that there is a different level of difficulty to awaken each fruit, your opinions are speculative. Not bad, but not necessarily something I can agree with at the moment. Thanks for your 2 cents, though.
For
@Charlotte Horchata's last point:
If Nika can shape his body however he wants, why wouldn't it revive Luffy after being melted by Akainu?