"Traction alopecia needs constant pulling" - sounds logical, yes. Thanks you.
About the toppik usage - I still need it to improve a bit posterior to hairline. I usually comb my hair up and this is worst for density and scalp coverage.
I'm 5.5 post HT, so I hope density along hairline continues to improve (?), maybe hair caliber will increase and maybe some more hair will pop out (?).