Rick, it's an obesum. It looks like an arabicum because of the wide caudex and the crown of stems on top. You certainly could have this one, I have a couple more like it.
I clicked the link you gave and knew right off before reading the text that the trees were Thai Soco's. It is my hope that the TS of which seeds you sent me will grow like those.
I looked closely at the picture of the arabicum with the centipede roots...I can see the line of demarcation where the base was cut...the same kind of line that you would see around a rooted cutting. Although the trained roots are impressive, the line takes away from it sorta kinda. I'm with the Thai Masters...Natural is beautiful.
(referring to arabicum roots)
EDITED
