Because generally an injectable oral will need some amount of guaiacol or at the very least a high percentage of benzyl benzoate to get it to hold .. ive never brewed superdrol so i was starting with a recipe i knew would most likely hold ...
if i experiment with it more ill dial back the solvent slowly on future brews until i find the point it will no longer hold at .
Its just easier doing it this way then going to light on solvent in the beginning , and then tweaking it and fighting it back into solution and keeping track of all your adjustments ..
Edit: also some people opt for using a ton of BB in these oral and suspension brews , i just prefer using a smaller amount guaiacol in them and being done with it ... some people dont like guaiacol or ethyl oleate , I dont mind either of them in my brews so im pretty liberal with them ... its all really just your personal preference ...