Agamon
Adventurer
You can increase the base by a rank without increaing the extras, but only if the extras are all the same rank as the base. Extras cannot exceed the base power in ranks, and you cannot increase the base power until al extra attached to it are caught up. So...
No.
Yes.
For example, in my case, do I have to save up 6 points to increase my elemental forms (and all their attached abilities) at once or could I spend 1 point to improve my forcefield to 7 and then save up 5 points to improve the base power when I get them?
No.
Or the other way, could I use 3 points to improve my energy control fire (base skill) plus the attached extra of element control air right now and then improve earth and water extras when I get 2 more points?
Yes.