Never really bothered with a loop on a belt knife then ive never really bothered with a belt knife I Prefer a smaller Neck knife and a bigger chopper set
I do have a Ferro with the necker But as pointed out Ferro exposed can crumble away Quickly
I also carry a lot more than 1 ferro and most used is the 8mm x 4" that i carry in my Zebra Billy can Hobo set as this is what comes out to camp cook But several others in various sizes from 2" to 12"
I do make ferro holders in Kydex for people and they can bolt em on or off as they like
See this is for Big Fires Or when i cant be Ar$ed to get out me armchair
Little one on the keys 2" for little fires in Tesco's
also got flint or can find some and a couple lighters and lifeboat matches etc