I still doubt it was a tear from training. The bruising and indent was on the outside of the biceps only. Never known anyone to tear their biceps just on the outside at the insertion. His biceps didn't become shortened, they just gained an incredible peak. He probably injected SEO into the outer biceps head near the top which created a bruise from some sort of damage to the tissue, hence the slight indent but no tear anywhere else. He was still able to get the results, which is why his peak was Arnold-esque at the Olympia. He never had that peak before.
Dorian didn't get a peak... his biceps just shortened. Completely different.