The Marble Queen Pothos is my favorite....it does not grow 6' long--and seems sturdier.
Since I was told--ages ago--that Any variegation is "man made", it is not unusual
for some of the stems of the Pothos to grow out totally green. Cut these down, totally,
if you want to keep just the variegated leaves. If you see an all-green stem growing--cut them off at the base.
You can root the all green stems--just saying---if you wan to keep the variegated look--
the green stems will take over and dominate.
Just FYI from my years of houseplants.... Gita