I actually think dynamics are important for girl with guitar if you want to really hear the voice nuance, string and body resonances. Don't know about "jump factor", but live music, even small scale, has great dynamics. I learned this lesson with the Master Signature and string quartets. That cartridge is more dynamic than my others and strings, voices, etc really benefit. Some will contend that my speakers choke off dynamics, but still.....
Dynamic driver speakers don't mean more dynamics necessarily