I have posted this before... But for some strange reason it seems
to fly over everyone's head ???
So, here goes... I will try again...
If you take a Home Depot special, with all those ridiculous ugly tuberous
roots that everyone says you can't make a decent Bonsai with, and you
let it grow aerial roots, it will cover these ugly roots in no time !!!
The reason why these plants are made in the first place, is to drastically
increase the size of ficus trunk in no time. If one grows these in a tropical
location, this plan works great !!! If you live outside of this range you can
just go around telling folks these are useless and not good for Bonsai !!!
If one looks at Adam's tree you can clearly see the larger tuberous roots
tuck back behind some of the smaller newer roots.
So, yes this was at one time exactly what the OP is doing.