2. All my characters minus my xelor have 6 mp so its more about of habit then necessity.
3. I went crit as my feca never dies so gaining the extra tankiness which the stats are poor like resistance to ciritcal hits or resistance to backstab seem overkill or pointless depending on which fight.
4. If you want to add fecablades to your build go for it. For me as I started previously without a way to instantly DE-activate glyph this makes them annoying in conjunction with close combat character. For my team I use a sram, I can only take a few mp off the boss and chances are the stonger the boss the less I will be able to move the boss to the exact cell I want possible screwing over the srams damage.
Remember guides are merely advice and opinions. My guide was requested by many players who were interesting to see what my build and reasons for the build are.