Repotting Phal after root rot

[priz_m]

Hi guys! One of my phals survived root rot thanks to sphag-n-bag (I lost the other though ) but I had it in LECA because I wanted to repot it in s/h but, funny thing happened, it developed new roots but (and I know this sounds way to funny) I honestly believe my phal is allergic to LECA , none of the new roots grew into the media, they grew outwards the pot, so long story short, I took it out of the bag 2 days ago and I want to repot it in a bark mix, BUT it has the core of the old root system, now, this only affects the height of the pot I’ll use, my question is.. should I cut it? Please advise, thank you!

Priz