That... depends on 2 things:
1. Are you whale?
2. What weapons in that element are good?
Light (because it's such a fucking good element you can always remember it)
Fire
Wind
Water
Thunder
Dark
Oh boy I suck at this one...
Well... this is off the top of my head, nothing exhaustive. But, general rules are: the more good FLBs in the element there are, the better that null grid will be.
No. Skill 1s of phantom weapons do not stack.Also, if you somehow managed to get 6 of the same phantom weapon, would that mean you could theoretically run a mixed element team and have comparable damage or would the damage difference be noticeable?