Loph 1yr onto Trichocereus

So now that I see this loph on such a big grafting stock I can see that if you wanted to root the loph on its own roots in the future this would be better than using some kind of grafting stock that the loph would grow over. Where you wouldnt be able to get all of the grafting stock seperated from the loph because it had grown over so much you couldnt get it to go on its own roots or cut away all of the grafting stock,you know what I mean.