This would be applicable to transdermal delivery or injections of pure testosterone. But in the case of injected testosterone esters, no aromatization can take place until the ester is cleaved from the testosterone, and this requires the esterase enzymes, which are in the plasma. In other words, regardless of delivery method, nothing much happens until after absorption, and by that time there's no distinguishing between different sources of the esters.... but perhaps in some men it has more active aromatase activity in the fat tissue. ...